Question

An atom have same mass number 40
an atomic number 19 then find the
number of protons of elections.
​

Answer 1

Explanation:

number of electrons= number of protons

and number of electronsin atom is 19, so number of protons= 19

Answer 2

atomic no = 19

mass number = 40u

no of protons = atomic no = 19

no of electrons = atomic no = 19

no of neutrons = mass number - atomic no = 40 - 19 = 21