In the nucleus of an adam there are 18 protons and 20 neutrons what are the atomic number and mass number of this isotope

The atomic number this isotope is 18.

The atomic mass this isotope is 38.

Explanation:

Atomic number(Z) = Total numbers of protons

Mass number (A) = Total number of protons(Z) + Total number of neutrons(N)

A = Z + N

We have :

Number of protons in a nucleus of a given atom of an isotope, Z= 18

Number of neutrons in a nucleus of a given atom of an isotope, N= 20

A = Z + N = 18 + 20 = 38

The atomic number this isotope is 18.

The mass number  this isotope is 38.

decomposition of water

Explanation:

The reaction will represent the decomposition of water. It usually carried by an electrolytic process in the laboratory.

Water molecule is broken down into its constituent hydrogen gas and oxygen gas components. The breaking down of one compound to give other compounds is decomposition. This is not a replacement reaction. In decomposition, we often start with a single reactant and results in one or more products.