Question

What does the number below each element’s symbol represent

Answer 1

The molar mass of the element (the average abundance of the element's isotopes)

Answer 2

Answer: The number written below element's symbol represents the atomic number of that element

Step-by-step explanation:

The general isotopic representation of an atom is:
`_Z^A\textrm{X}`

where,

Z = Atomic number of the atom

A = Mass number of the atom

X = Symbol of the atom

For Example: Isotope of chlorine (Cl-37)

Isotopic representation is
`_(17)^(37)\textrm{Cl}`

where,

17 is the atomic number of chlorine

37 is the mass number of chlorine

Cl is the symbol of chlorine element

Hence, the number written below element's symbol represents the atomic number of that element