Question

an element with atomic number 20 and mass number 40. write down the number of electron proton and neutron​

Answer 1

$\huge\mathfrak\green {Question-}$

QUESTION?

an element with atomic number 20 and mass number 40. write down the number of electron proton and neutron.

$\huge\mathfrak\green {Answer-}$

ANSWER.

Number of Protons = atomic number = 20.

Therefore, number of protons = 20.

Number of electrons = number of protons = 20.

Number of neutrons = Mass number - number of protons = 40-20 = 20.

The only option states wrong about Ca is C.