Other planets have an atmosphere, but Earth's is unique because it has large amounts of _____.nitrogen
oxygen
water vapor

Answers

Answer 1

Answer: the answer is oxygen because, all the other planets don't provide life and air

Answer 2

Answer:

Just had this question, oxygen is the correct answer

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The following balanced equation shows the decomposition of water (H2O). According to the equation, how many oxygen atoms are in the reactants? 2 H2O 2H2 + O2

Answers

Answer : The number of oxygen atoms present on reactant side are, 4

Explanation :

Balanced chemical reaction : It is defined as the number of atoms of individual elements present on reactant side must be equal to the product side.

Decomposition reaction : It is defined as the reaction in which the larger molecule decomposes to give two or more smaller molecules as a product.

The given balanced chemical reaction is,

$2H_2O\rightarrow 2H_2+O_2$

From the balanced chemical reaction we conclude that, there 4 atoms of hydrogen and 2 atoms of oxygen present on both reactant side and product side.

Hence, the number of oxygen atoms present on reactant side are, 4

2 atoms of oxygen are reactants.

As you go down the periodic table, the atomic radius of elements do what?

Answers

Atomic radii increase as you travel down the periodic table, due to increasing number of electron shells.

Increase. This is because more energy levels are available the lower you go in the table.

Why is ice melting a physical change?

Answers

Answer:As an ice cube melts, its shape changes as it acquires the ability to flow. However, its composition does not change. Melting is an example of a physical change .

Explanation:

A sample composed only of atoms having the same atomic number is classified as(1) a compound (3) an element
(2) a solution (4) an isomer

Answers

A sample composed only of atoms having the same atomic number is classified as " element".

What is element?

A pure substance made up entirely of atoms with almost the same number of protons in respective nuclei was known as an element.

What is atoms?

Atoms are "the fundamental building components of matter," according to Wikipedia. It is the lowest fundamental unit of matter which thus possesses chemical element qualities.

A sample composed only of atoms having the same atomic number is classified as " element".

Therefore, the correct answer will be option (3).

To know more about atom and element.

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A sample composed only of atoms having the same atomic number is classified as element.

What makes an atom able to form a compound? * O different number of neutron than protons O unfilled outer electron shells O same number of protons as electrons O a positive ot negative charge of the nucleus

Answers

Answer:

same number of protons as electrons

Explanation:

The addition of a neutron can make an atom radioactive. When you change the number of protons in an atom, you will change the atom from one element to a different element. ... If you change the number of electrons in an atom, you will get an ion of the element.

Which of the following shows a periodic pattern?A.there are two ducks in one pond.

B.there is meat next to the cheese in the refrigerator

C.a boy waits five minutes to talk to his father

D.the mother takes her medication everyday at seven