The rows in the periodic table are called periods.
What is true about elements in the same period?

Answers

Answer 1

Answer:

elements in the same period have the same number of shells

the period number the element is in, that is the number of shells it has.


Related Questions

Someone help me plz.

In each of the following pairs, circle the form of radiation with the LONGER WAVELENGTH:

A. red light or blue light

B. microwaves or radiowaves

C. infrared radiation or red light

D. gamma rays or UV rays​

Answers

Answer:

In the first one in a it is red light in b it is radio waves in c it is infrared radiation and d is UV radiation

Explanation:

The forms of radiation from the pairs listed that have longer wavelength are :

A) Red light

B) Radio waves

C) Infrared radiation

D) UV rays

Red light have a wavelength between 650 to 720 nm while a Blue light has a wavelength of 380nm to 500nm which makes it to produce a high energy  visible light.( HEV ) light. therefore the Red light has a longer wavelength.

The wavelength of a microwave is approximately  30 centimeters to 1 millimeter, which makes it shorter than the wavelength of a radio wave ( shortest wavelength in the electromagnetic spectrum.

Hence we can conclude that The forms of radiation from the pairs listed that have longer wavelength are A) Red light B) Radio waves C) Infrared radiation D) UV rays

Learn more about the electromagnetic spectrum : https://brainly.com/question/4533497

does this picture show a physical or chemical change?

Answers

Answer:

Those photos are a chemical change

How many moles of NaOH are in a 75.89g sample? (mass= 40.01 g) (Show your work)

Answers

Answer:

1.896 moles of NaOH-----> 1.90 moles

Explanation:

Written- out Method:

75.89 g of NaOH  |  1 mole of NaOH  

                             |  40.01 g NaOH                = 1.896 -----> 1.90 moles of NaOH

Plug into calculator method:

(75.89 g NaOH/ 40.01 g NaOH = 1.896 -----> 1.90 moles of NaOH

pure sodium and chlorine are extremely dangerous, but when combined the result in substance that we use every day. How do you think the properties of sodium and chlorine change when they are combined to make sodium chloride?

Answers

Answer:

Explanation:

chlorine has 7 valence electrons while sodium has 1. on their own, they are very reactive elements. a full valence electron shell has 8 electrons, so when elements combine and have 8 electrons in their outer shell, they are not reactive. when sodium and chlorine are combined to form sodium chloride (table salt), it is no longer dangerous. the number of valence electrons changes its reactivity and how it combines.

The properties of sodium and chlorine change when they are combined to make sodium chloride should be explained below.

Information regarding chlorine:

chlorine comprises of 7 valence electrons while on other hand, sodium has 1.  A full valence electron shell contains the 8 electrons, so when elements combine and have 8 electrons in their outer shell, they are not reactive.

learn more about substance here: https://brainly.com/question/19287431

What is the atmoic number for potassium?​

Answers

Answer:

19

Explanation:

it is 19 for potassium

                                               

whats the volume of a 2 year old

Answers

Answer:

here's a great idea!

take a jug of water by finding the volume of that water and ask the 2 year old to chug it all in... the volume of water drank by the 2 year old is the volume of the two year old

Which unit is not a measurement of volume?

cm^3
Ocm
Oml
OL

Answers

Answer:

cm is a measure of length not volume

Answer:

I think it's Cm:)

Hope this helps

what is the central dogma of biology? QUICK PLEASE

Answers

Answer:

The central dogma states that the pattern of information that occurs most frequently in our cells is: From existing DNA to make new DNA (DNA replication?) From DNA to make new RNA (transcription) From RNA to make new proteins (translation).

Explanation:

Which of the following is the unit of measurement used to describe the severity of an earthquake?

Answers

Answer:

Try magnitude.

Explanation:

Answer:

The Richter scale measures the largest wiggle (amplitude)

Explanation:

The Richter scale measures the largest wiggle (amplitude) on the recording, but other magnitude scales measure different parts of the earthquake. ... Intensity is a measure of the shaking and damage caused by the earthquake; this value changes from location to location.


Why can astronauts jump so high, and "hang" so
long, on the moon?

Answers

gravity is stronger on the earth, and gravity is what brings you back down

so, if there's less gravity, then there's more air time

Answer:

Low gravity

Explanation:

The moon has lower gravity than Earth, therefor when someone jumps, they will not return to the surface automatically.

How is Mass converted to the energy released in the fire

Answers

Answer:

The heat and light released by fire comes from the breaking of chemical bonds. ... The mass of each molecule, before burning, exceeds the total mass of its atoms by a tiny amount that is equivalent (through E=mc²) to the total energy of all its atomic bonds.

Explanation:

I hope this helps (:

Using the table on the right, perform the following metric unit conversions. Type your answer in the space provided.

0.001087 kg =
g

Answers

Answer:

1.087g

Explanation:

you can use the reminder King Henry Died By Drinking Chocolate Milk. You wanna that the period and move it right 3 times till you get to by.

Answer:

The first answer is 0.001087 kg =  1.087 g

The second answer is 25 mL =  0.025  L

Then the third answer is 531 ms =  0.531  s    

Based on your data, how are elements arranged into chemical families?

Answers

Answer:

Based on their groups

Explanation:

Answer:

They are arranged vertically depending on how many valence electrons they have, if they have the same amount, they will have the same chemical family in each column.


Mark is pushing a box down the hall. Mark is using 5N to push the box 20m. How much work is Mark doing?

Answers

The work by Mark : 100 J

Further explanation

Work is the transfer of energy caused by the force acting on a moving object  

Work is the product of force with the displacement of objects.  

Can be formulated  

[tex]\tt W=F\times d[/tex]

W = Work, J, Nm  

F = Force, N  

d = distance, m  

Mark is using 5N to push the box 20 m,

F = 5 N

d = 20 m

[tex]\tt W=5\times 20\\\\W=100~J[/tex]

Bonus question #2: Unknown element, Element X, exists in nature as two isotopes:
^{351}
351

X has a mass of 350.9196 u and
^{353}
353

X has a mass of 352.9209 u. The average atomic mass of Element X is 351.96 u. Calculate the relative abundance of the two Element X isotopes.

Answers

Answer:

Explanation:

your answer is 351.96 i not a 100 per sent right but that should be it

Human body uses the energy provided from food digestion. Endothermic or exothermic?

Answers

Answer:

Endothermic

Explanation:

Exo is outside so exothermic would be outside the body

The carbohydrates are break down into glucose. Then glucose combines with oxygen in the cells and provides energy. Hence, digestion is an exothermic process.

What is an exothermic process ?

Food digestion produces heat. This happens as a result of the organism releasing heat during meal digestion. A process that releases heat is exothermic.

Heat is released during an exothermic reaction, raising the temperature of the immediate environment. The environment is cooled through an endothermic process that absorbs heat.

Glucose is created by the breakdown of these carbs. In the cells of our body, this glucose interacts with oxygen to produce energy. So, the process of digesting is exothermic.

Chemical processes involved in food digestion disassemble large food molecules into smaller, more manageable "building block" components.

Thus, Human body uses the energy provided from food digestion is exothermic process.

To learn more about exothermic process, follow the link;

https://brainly.com/question/12321421

#SPJ2

A snicker bar has 300. Kcal, how many Joules of energy does it contain?

Answers

Answer:

1255200J

Explanation:

1 cal = 4.184 J

1kcal = 4184 J

thus, 300 kcal= 4184 × 300

= 1255200J

= 1255.2 kJ

= 1.2552 MJ

For the n = 3 electron shell, which of the following quantum numbers are valid? Check all that apply.

Answers

Answer:

The valid quantum numbers are l=0, l=-2 and l= 2.

Explanation:

Given that,

n = 3 electron shell

Suppose, the valid quantum numbers are

l = 3

m = 3

l = 0

m = –2

l = –1

m = 2

We know that,

The value of n = 3

Principle quantum number :

Then the principal quantum number is 3. Which is shows the M shell.

So, n = 3

Azimuthal quantum number :

The azimuthal quantum number is l.

[tex]l=0,1,2[/tex]

Magnetic quantum number :

The magnetic quantum number is

[tex]m=-2,-1,0,1,2[/tex]

Hence, The valid quantum numbers are l=0, l=-2 and l= 2.

Answer: I = 0  m = -2 m = 2

Explanation: Edge.

the correct answers to the second part of this are:

n = 1, I = 0, m = 0

n = 3, I = 0, m = 0

n = 5, I = 4, m = -3

The nucleus is held closely together by?

Answers

The nucleus of an atom is held together by the strong nuclear force to hold together protons and neutrons. The strong nuclear force is stronger than electricity and gravity. It's even the strongest out of the four fundamental forces.

Examples of physical change include?

A. Melting
B. Boiling
C. Freezing
D. All of these are examples of physical change

Answers

Answer:

All of these examples are physical changes.

Explanation:

Physical changes are changes affecting the form of a chemical substance, but not its chemical composition.

there are 20 _______ amino acids (9)

(fill in the blank)

Answers

Answer: different

Explanation: There are 20 different amino acids.

Metamorphic means “________________.”
A}to turn into rock
B]to make into minerals
C]to change form
D]to press down

Answers

C) To change form

In Greek metamorphic means 'to change form ' . Hence the answer to this question will be ;

C) To change form

In dilute aqueous solution, as [H+] increases:
A. pH decreases
B. pOH increases
C. [OH-] decreases

Answers

Answer:

B

Explanation:

The answer is B, I hope this helps you!

which solution is most likely to conduct electricity when it is dissolved in water?

a)CH3OH
b)C6H12O6
c)SrCl2
d)NH3

Answers

Explanation:

Glucose (C₆H₁₂O₆) is an electrolytes hence it conduct electricity.

Therefore,

Option B is correct.


Is carbon a metal or a nonmetal? How many valence electrons does a carbon atom have?

Answers

Answer:

Carbon is a solid non-metal element. Carbon has eight valence electrons.

Explanation:

Hope this helps!!

A student found a 500 cm3 sample of vinegar. Knowing that vinegar is a solution of ethanoic acid (CH3COOH) and water, this student decided to take a 25.0 cm3 sample, dilute it with 25.0 cm3 of water and then react it with sodium hydroxide. The dilute sample required 37.0 cm3 of 0.850 mol dm–3 sodium hydroxide solution to react entirely with it via the following reaction:

CH3COOH(aq) + NaOH(aq) → NaCH3COO(aq) + H2O(l)

Calculate the concentration of ethanoic acid in the original sample of vinegar.

Answers

Answer:

1.26mol/dm3

Explanation:

Using the em figure what color is the wavelength 436 nm

Answers

Answer:

Blue

Explanation:

Science investigation skills

Answers

People conduct scientific investigations by formulating a hypothesis and observing the results. They then draw conclusions from those results and then share those conclusions with the larger scientific community.

C12H7Cl3FNaO2 what are the elements in that chemical formula

Answers

Answer:

hope it helped you

Explanation:

Sodium fluoride - 5-chloro-2-(2,4-dichlorophenoxy)phenol (1:1:1) | C12H7Cl3FNaO2 |

What is a catchy title for a science project on crystals?

Answers

Answer:

Crystal Clear Thinking

A Crystal Clear Idea

Crystals -The Diamond Wannabes of the World

Crystal Clear

Crystal Cool!

A New World ~ made Crystal Clear for You

The Science Behind The Shine

Crystal-ology

Classy Glass

Explanation:

Hope this helps and good luck with your project!

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