Question

A chemical element (X) is represented by ${}_Z{X}^A$. If ‘X’ is any element, then what do ‘A’ and ‘Z’ stand for?

• A. Z - Atomic number; A - Mass number
• B. Z - Mass number; A - Atomic number
• C. Z - no. of neutrons; A - no. of electrons
• D. Z - no. of protons; A - no. of electrons

Answer 1

The correct option is A Z - Atomic number; A - Mass number

In the representation of chemical elements, ‘Z’ represents atomic number which determines the number of protons in the atom of an element. ‘A’ represents mass number which determines the atomic weight.