Question

what is the mass number of x​

Answer 1

please give us full information...but

to find mass number here is a formula for you..

mAss number of 'x' = Atomic number - number of neutron.

or

Mass number of 'x' = Number of protons + Number of neutons

Hope it will helps you

_________★rocky ☺

Answer 2

Answer:

Explanation:mass no of x is sum of no of protons and neutrons in atom x