for which elements are outer electrons and valence electrons the same?

Answers

Answer 1

Answer:

The number of electrons in the outermost shell of a particular atom determines its reactivity, or tendency to form chemical bonds with other atoms. This outermost shell is known as the valence shell, and the electrons found in it are called valence electrons.

Explanation:

Answer 2

Elements of same group have same number of valence electrons and similar physical and chemical properties.

What are groups in periodic table ?

A periodic table is classified into different columns and rows. The vertical columns in the table are called groups and the horizontal rows are called periods.

From left to right, the atomic number of elements increases by one and atomic size increases.  Down a group, the number of electrons and atomic size as well increases.

Elements of same groups have same number of outer electrons or valence electrons. They show similarities in chemical and physical properties.

For example,  lithium and sodium are in the first group. They both have one valence electron.

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Related Questions

How
many
moles is 2.55 X 1026 atoms of Neon?

Answers

Answer:

423.44 moles

Explanation:

What is a chemical bond?
A. An intramolecular force holding 2 atoms together
B. An attractive force between 2 molecules
C. A gravitational force holding electrons in their orbits
D. An electrostatic force between a proton and an electron

Answers

A chemical bond is an electrostatic force between a proton and an electron. Hence, option D is correct.

What is a bond?

A chemical bond is what holds atoms together in molecules.

A chemical bond is what holds atoms together in molecules.

Bonds arise from the electrostatic forces between positively charged atomic nuclei and negatively charged electrons (the positions of which in space are determined by quantum mechanics).

Hence, option D is correct.

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a substance that can be broken down into simpler substances

Answers

Answer:

compound

Explanation:

hope this hepls

I need help with this question

Answers

It would be 4-ethyldecane. It has 12 carbons.

Describe ions of xenon

Answers

Answer: a common ion of xenon is fluoride-ion. xenon oxide difluoride is also a fluoride-ion acceptor, forming the only other anion containing xenon in the +4 oxidation state, the XeOF3− anion in Cs+XeOF3−. Xenon hexafluoride is both a strong fluoride-ion donor and a strong fluoride-ion acceptor.

If you have a ring that contains 1.94 g of gold, how many atoms of gold are there in the ring?

Answers

the molar mass would be 197.0 g

why does a diprotic acid dissociate in a stepwise manner

Answers

Because they have the ability to supply exactly two protons.

Hope this helps!

A diprotic acid dissociates in a step wise manner as it has two protons and it looses one proton each in each dissociation step.

What are acids?

Acids are defined as substances which on dissociation yield H+ ions , and these substances are sour in taste. Compounds HCl, H₂SO₄ and HNO₃ are acids as they yield H+ ions on dissociation.

According to the number of H+ ions which are generated on dissociation acids are classified as mono-protic , di-protic ,tri-protic and polyprotic  acids  depending on the number of protons which are liberated on dissociation.

Acids are widely used in industries  for  production of fertilizers, detergents  batteries and dyes.They are used in chemical industries for production of chemical compounds like salts which are produced by neutralization reactions.

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According to the following map, what is a type of mineral found in Mexico?
a Bauxite
b Copper
c Gold
d Zinc​

Answers

Answer:

B. Copper

Explanation:

According to the map, the minerals found there are:

IronSilverCopper

The only mineral given as an option is copper. Therefore, the answer is B.

in what states of matter are the atoms constantly moving in a substance or material?

Answers

Answer:

LIQUID

Explanation:

A substance that flows and keeps no definite shape because its molecules are loosely packed and constantly moving. It takes the shape of its container but maintains constant volume.

A. An atom neutral (one with 0 extra charge)?

Answers

Answer:

Neutron is the correct answer.

Why isn’t a dream made of matter?

Answers

Most dreams are so mundane that we forget about them almost immediately after they occur. Amusingly, Freud attributed this amnesiac disposition to the actual content of dreams. According to him, the content is so intensely sexual and violent that our mind must repress it in order to maintain its health.

how to keep apples from browning without lemon juice?

Answers

Answer:

eat

Explanation:

eat the dang apples

The compound ammonium sulfate consists of two ions, NH4+ and SO42–, both of which are

Answers

They are both (polyatomic) ions.

2. Which diagram represents deposition?
A liquid —>solid
B gas-> Solid
C liquid->gas
D solid—>gas

Answers

your answer would be B I’m pretty sure.

need help!!
Is the atomic number of an atom equal to the electrons in an atom​

Answers

Answer:

YES.

Explanation:

The atomic number is the number of protons. Because the number of protons is EQUAL to the number of electrons, they're basically equal.

EXPERIMENT 4 : TYPES OF PLATE BOUNDARY

Answers

Answer:

Movement in narrow zones along plate boundaries causes most earthquakes. Most seismic activity occurs at three types of plate boundaries—divergent, convergent, and transform. As the plates move past each other, they sometimes get caught and pressure builds up.

Explanation:

A spoon. A beaker partially filled with liquid. A stirring rod. A graduated cylinder. Distilled water in a spray bottle. Which of the following tools could have become cross-contaminated during the experiment if you had not cleaned them carefully between successive tests? Spoon Beaker Stirring Rod Graduated Cylinder Distilled water in spray bottle.

Answers

Answer:

A,B,C,D

Explanation:

Answer:

A,B,C,D

Explanation:

Proof

12. The smallest unit of an element that has all of the properties of the element is a/an
A. molecule.
B. cell.
C. atom.
D. neutron.

Answers

The answer is C: atom

n atom is a particle of matter that uniquely defines achemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons. Each electron is negatively charged. The nucleus is positively charged, and contains one or more relatively heavy particles known as protons and neutrons.

Answer:

Explanation:

You have given the exact definition of what an atom is. It is the smallest entity that has all the same properties as a bunch of atoms put together.

a positively or negatively charged particle is called:

Answers

Answer:

A positively or negatively charged particle is called an ion.

Explanation:

Ions form when they lose or gain electrons in order to become stable by filling their octet. When an element lose an electron(s), it becomes positively charged and occpanies the symbol (+). When an element gains an electron(s), it becomes negatively charged and occpanies the symbol (-).

1. Hydrogen and nitrogen combine to form ammonia. When nitrogen and hydrogen bond, nitrogen pulls the electrons from hydrogen toward itself. Which statement about the reactants is correct?
A) Hydrogen is oxidized, and nitrogen loses electrons.
B) Hydrogen is oxidized, and nitrogen is reduced.
C) Hydrogen gains electrons, and nitrogen is reduced.
D) Hydrogen is reduced, and nitrogen is oxidized.

2. Which phrase best defines a redox reaction?

A) A reaction in which the number of oxygen atoms is reduced.
B) A reaction in which elements are transferred between different atoms.
C) A reaction is which oxygen combines with different atoms.
D) a reaction in which elements are released from the system.

3.Which statement describes the process of oxidation?

A) Oxidation results in a loss of electrons, so the oxidation number increases.
B) Oxidation results in a gain of electrons, so the oxidation number increases.
C) Oxidation results in a gain of electrons, so the oxidation number decreases.
D) Oxidation results in a loss of electrons, so the oxidation number decreases.

4. Which chemical equation represents a redox reaction?
A) TiCl4(s) + 2H2O(g) → TiO2(s) +4HCl(g)
B) CaO(s) + SiO2(s) → CaSiO3(l)
C) CaCO3(s) → CaO(s) + CO2(g)
D)Fe2O3(s) + 2Al(s) → Al2O3(s) +2Fe(l)

5. Which elements are oxidized and reduced in the reaction below?
Br2 (l) + 2NaI(aq) → I2 (s) + 2NaBr(aq)

A) Bromine (Br) is oxidized, and iodine (I) is reduced.
B) Iodine (I) is oxidized, and bromine (Br) is reduced.
C) Sodium (Na) is oxidized, and bromine (Br) is reduced.
D) Bromine (Br) is oxidized, and sodium (Na) is reduced.

Answers

Answer:

did you do it yet?

Explanation:

Answer:

1. Hydrogen is oxidized, and nitrogen is reduced.

Explanation:

Help please and thank you for who ever

Answers

Answer:the first one

Explanation:

Answer:

Ribosomes are found in both cells

Balance the following equations:

1.
Fe(s)+ O2(g) —> Fe2O3(s)

Answers

Answer:

4Fe(s)+3O2(g) ----> 2Fe2O3(s)

Which of the following molecules contains a covalent bond? (Use the electronegativity values from the periodic table to help you answer this question.)

Answers

CN- is the molecule which contains a covalent bond in this scenario.

What is Covalent bond?

This is the type of bond formed as a result of sharing of electrons between atoms of elements.

It exists in the reaction between compounds between two electronegative elements such as carbon and nitrogen to form cyanide.

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which electron carrier is not mobile or diffusible in the mitochondrial electron transport chain?

Answers

Answer:

FAD is the correct answer

Explanation:

pls choose it as the brainiest answer

 

the elements on the periodic table are arranged in order of increasing

Answers

Answer:

atomic number

Explanation:

In an AP Chemistry laboratory, students were given two unlabeled beakers and told that one of the beakers contained 1.0g of solid CaCO3 and the other contained
1.0g of solid AgNO3. They were told to devise an experiment to identify which compound was which. A student did so by adding 50 mL of distilled water to each beaker. Describe the student's observations that allowed him to identify each compound.

Answers

When the student adds 50 mL of distilled water to each beaker, CaCO3 will not dissolve in water while AgNO3 will dissolve completely in water.

We have to recall that according to the solubility rules, the carbonates of group two elements are insoluble in water. The solubility rules offer a convenient way of predicting the solubility of a compound in water.

When the student adds 50 mL of distilled water to each beaker, CaCO3 will not dissolve in water while AgNO3 will dissolve completely in water. This is because,  the carbonates of group two elements are insoluble in water.

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Which of the following forms of alcohol can be consumed? A. Propanol B. Methanol C. Butanol D. Ethanol Please select the best answer from the choices provided. A B C D.

Answers

Answer:

D. Ethanol

Explanation:

because Propanol, Methanol and Butanol are not safe to consume. soo the answer is Ethanol

Ethanol forms of alcohol can be consumed.

What is ethanol?Ethanol is used in the manufacture of medication, plastics, lacquers, polishes, plasticizers, and cosmetics. Ethanol is used in medicinal drugs as a topical antiinfective, and as an antidote for ethylene glycol or methanol overdose.Industrial merchandise containing ethanol include beverages, perfumes, aftershaves and colognes, medicinal liquids, mouthwashes, liniments, and a few rubbing alcohols.within the worst cases, there will also be breathing issues, low blood strain, incontinence heart issues, blood issues, liver damage, and demise. Ethanol may also dry out and irritate the pores and skin; there may be aches, redness, and swelling. Eye exposure to ethanol can also cause tearing, burning, and stinging.

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What mass of aluminium is needed to react with 640g of iron oxide

Answers

Answer:

13.5g

Explanation:

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 138.8g of aluminium is needed to react with 640g of iron oxide.

What is mole?

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically, the balanced equation can be written as

3Fe[tex]_2[/tex]O[tex]_3[/tex] + 4Al [tex]\rightarrow[/tex] Al[tex]_2[/tex]O[tex]_3[/tex] + 6Fe

number of moles of iron oxide= 640/159.6

                               =4.01

number of moles of aluminium =(4/3)×4.01

                                =5.34moles

mass of aluminium =5.34×26

                               =138.8g

Therefore, 138.8g of aluminium is needed to react with 640g of iron oxide.

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Three students are labeling organisms in their diorama. Zola wants to label the algae and mushrooms as photosynthetic. Saffi wants to label plants and algae as photosynthetic. Ahmed wants to label plants and all bacteria as photosynthetic. Who is correct?
-Saffi and Ahmed
-Zola only
-Saffi only
-Zola and Ahmed

Answers

Answer:

Saffi only

Explanation:

I just took the test and that was the correct answer :)

How many moles of ammonium ions are in 125 mL of 1.40 M NH4NO3 solution? ________ moles (give answer with correct sig figs in units of moles without scientific notation)

Answers

The number of mole of ammonium ion, NH₄⁺ in the solution is 0.175 mole

We'll begin by calculating the number of mole of NH₄NO₃ in the solution. This can be obtained as follow:

Volume = 125 mL = 125 / 1000 = 0.125 L

Molarity = 1.40 M

Mole of NH₄NO₃ =?

Mole = Molarity x Volume

Mole of NH₄NO₃ = 1.40 × 0.125

Mole of NH₄NO₃ = 0.175 mole

Finally, we shall determine the number of mole of ammonium ion, NH₄⁺ in the solution. This can be obtained as follow:

NH₄NO₃(aq) —> NH₄⁺(aq) + NO₃¯(aq)

From the balanced equation above,

1 mole of NH₄NO₃ contains 1 mole of NH₄⁺

Therefore,

0.175 mole of NH₄NO₃ will also contain 0.175 mole of NH₄⁺

Thus, the number of mole of ammonium ion, NH₄⁺ in the solution is 0.175 mole

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