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What is the atomic number of this element?

Answer:

Because sodium is on the left side of the PT and phosporus is on the right side. And atomis radius decreases from left to right.

Explanation:

Answer:

6u and 7u

Explanation:

no of neutrons in 1= 3

no of protons in 1=3

mass=3+3=6

same method applies to the 2nd one

Answer:

The Ring of Fire, also referred to as the Circum-Pacific Belt, is a path along the Pacific Ocean characterized by active volcanoes and frequent earthquakes. The majority of Earth's volcanoes and earthquakes take place along the Ring of Fire

Explanation:

google

Answer:

Most earthquakes occur along the edge of the oceanic and continental plates. The belt exists along boundaries of tectonic plates, where plates of mostly oceanic crust are sinking beneath another plate.

Most volcanoes are found along a belt, called the “Ring of Fire” that encircles the Pacific Ocean. As the plates move, they spread apart, collide, or slide past each other. Sixty percent of all active volcanoes occur at the boundaries between tectonic plates.

Answer:

Water vapor has mostly disappeared at colder elevations and its effect on weather turbulence.

Explanation:

Answer:

B. Water vapor and its effect on weather turbulence has mostly disappeared at colder elevations.

Explanation:

Hope this helps

Answer:

C. There is a negative acceleration

Explanation:

I majored in Physics

Answer:

I think crystallization is a write answer for this question

Explanation:

but according to this (E is the write answer)

Answer:

atmosphere, break up

Explanation:

Answer:

Atmosphere, break up

Explanation:

Answer:

A gaping hole in the ozone layer over Antarctica was discovered in the mid 1980s. The international community agreed the Montreal Protocol in 1987, which banned most of the offending chemicals.

all the elements in group 18 are Nobel gases or inert gases . all the elements such as neon , helium, argon etc. ,their outermost shell is completely filled . The noble gases have the largest ionization energies, reflecting their chemical inertness

Answer:

2.75 × 10^-45 m

Explanation:

From;

E= hc/wavelength

h= Plank's constant= 6.6 × 10^-34 Js

c= speed of light=3× 10^8 ms-1

Wavelength = 6.6 × 10^-34 × 3× 10^8/7.21 × 10^19

Wavelength= 2.75 × 10^-45 m

Answer:h

Explanation:

Answer: 10 grams

Explanation: Original sample is 80 gram and every three days half of its composition decays so 80 down to 40 in the first 3 days, 20 in the next three days, and  10 in the last three days

Explanation:

calcium hydride + water → calcium hydroxide + hydrogen

hope it helps!

Answer:

B

Explanation:

got it right on edg

Nuclear fusion reactions release high energy and required tremendous temperature of nuclear reactors is the main reason for not used to generate electricity.

Nuclear reactions are those reactions which are taking place in the nucleus of any unstable atom and produces energy.

As in the question it is given that nuclear fusion reactions releases more energy and less wastage, but this energy are releases in the tremendous amount which can be proved harmful for the environment and the humans. To carry out this reaction we have to maintain the very high temperature of nuclear reactors of about 6 times greater than sun's temperature, which is not possible manually.

Hence, high temperature of nuclear reactors and high amount of energy released is the main reason.

To know more about nuclear reactions, visit the below link:

https://brainly.com/question/984564

Answer:

Explanation:

It is not neutral.

Magnesium would have a charge of plus 2. That makes it a cation. The Cathode attracts + charged ions.

Answer:

D. ocean ridges​

Explanation:

Answer:

I think A

Explanation:

Most volcanoes form at the boundaries of Earth's tectonic plates. ... The two types of plate boundaries that are most likely to produce volcanic activity are divergent plate boundaries and convergent plate boundaries

Answer:

a.) A starch sample turns blue when introduced to iodine

Explanation:

A is a chemical change whereas the other answers would be physical changes.

The chemical property has been the turning of the iodine blue with starch introduction. Thus, option A is correct.

The substance properties can be differentiated as Physical properties and chemical properties. Physical properties can be defined as the properties that do not lead to the change in the chemical composition of the compound, For example, electrical conductivity, malleability, density, etc.

The properties of the compound that have been led to the change in the chemical composition of the compound have been termed chemical properties. For example. burning, reduction, etc.

Since the starch sample has been reacted with iodine there has been a chemical change that leads to the product of blue color. Thus, the starch turning iodine blue has been the chemical property. Thus, option A is correct.

For more information about the chemical properties, refer to the link:

https://brainly.com/question/5186976

Chemical Equation Balancer

Answer:

Niche i think

Explanation:

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Answer:

6

Explanation:

because newtrons dont have a charge so the red ones in the middle count those and you get 6

Answer:

The answer is 6

Explanation:

Answer:

It is balanced.

Explanation:

You have the same amount of atoms on both sides. 2 carbon and 4 oxygen.

Answer:

The Middle Years

Explanation:

Depending on the size of the star, the period of which thermal energy is created through the process of nuclear fusion can vary. However, for the life cycle of an average star, this can be roughly a few billion to 10 or even 15 billion years

Answer:

BF3

Explanation:

For this question, you need to use the number of valence electrons present in each element. Boron is in group 3/13 on the periodic table so you know it has 3 valence electrons while Fluorine is in group 7/17 so it has 7 valence electrons. These elements are both covalent so they will share electrons. All elements in the first three rows want to reach either have 8 valence electrons or zero valence electrons depending on whichever is easier. When B and F interact each Fluorine will only want to take one electron, but Boron wants to get rid of all 3 electrons, so it will bond with 3 Fluorine to get rid of all its valence electrons.

I hope this helps.

Mass of water vapor = 193 g

Given

435 kJ of heat are released

Required

mass of water vapor

Solution

The heat to change the phase can be formulated :

Q = mLf (melting/freezing)

Q = mLv (vaporization/condensation)

Lv for water = 2256 kJ/kg or 2256 J/g or 40.7 kJ/mol

So the mass of water vapor :

[tex]\tt m=\dfrac{Q}{Lv}\\\\m=\dfrac{435000~J}{2256~J/g}\\\\m=192.8\approx 193~g[/tex]

Answer:

The coordination number is 8

Potassium nitrate has an octahedral coordination structure

Answer: c. peanut oil

Explanation: