Enter the appropriate symbol for an isotope of calcium-42 corresponding to the isotope notation azx

Explanation:

Mass number is defined as the sum of number of protons and neutrons that are present in an atom.

Mass number = Number of protons + Number of neutrons

Given mass number of calcium= 42

Atomic number is defined as the number of protons or number of electrons that are present in an atom.

Atomic number = Number of electrons = Number of protons

General representation of an element is given as:

where,

Z represents Atomic number

A represents Mass number

X represents the symbol of an element

Calcium is the 20th element of the periodic table with atomic number of 20 and is written as

answer: h+ its less than oh

explanation:

i just learnt this recently but i need to look through my notes again