Question

If a neutral atom has 54 protons and 70 neutrons what is the atomic number and mass number

Answer 1

Atomic number = 54

Mass number = 124

Given that,

• No. of protons (Z) : 54
• No. of neutrons (n) : 70

we are to find

• The atomic number
• Mass number(A)

we know that,

• atomic number = no. of protons in an atom
• atomic number of the given atom = 54

and

• Mass no. = No. of protons + No. of neutrons
• Mass no. of the given atom = 54 + 70 = 124