Question

The image shows the representation of an unknown element in the periodic table.

Answer 1

Answer is: The sum of the masses of protons and neutrons is 20.1797.

This element (neon) has atomic number (Z) 10, which means it has 10 protons and 10 electrons.

Atomic number (Z) is the number of protons, which is characteristic of a chemical element.

Atomic mass (A) is 20.1797.

Ar is relative atomic mass (the ratio of the average mass of atoms of a chemical element to one unified atomic mass unit) of an element .

Answer 2

Answer:

the sum of the masses of protons and neutrons is 20.1797

Explanation: