Question

an atom x has 10 electrons and 12 neutrons . what is the atomic number and mass number of the element x .​

Answer 1

Explanation:

The total number of protons and neutrons in the nucleus is called mass number of the atom. It is generally represented by th letter A.

Mass Number(A) = Number of Protons + Number of Neutrons

As given, the atom of an element contains 10 protons and 12 neutrons , therefore,

mass number = 10 + 12 = 22

So, the mass number of the element is 22.

Answer 2

Answer:

Atomic Number: 10

Mass Number: 22

Explanation:

First the element must be identified and that can be done using the number of electrons. The number of electrons must be equal to the number of atoms, making the atomic number 10 ie. Neon. The mass number then is simply the atomic number + the number of neutrons, which in this case is 10 + 12, which is 22.