Question

An atom has a proton number of 19 and a nucleon number of 39. Calculate the number of protons and neutrons in the atom.​

Answer 1

Answer:

Newtrons=39-19=20

so neutron number is 20

nucleons - is proton or neutron

Reason: nucleons contain both protons and neutrons as protons number is given ( 19 ) so neutron is 20.

Answer 2

Answer:

The Atomic number (Z) of any atom is the total no. of protons in the Nucleus. They are positively charged sub-atomic particles.

The Mass number (A) is the total no. of protons and neutrons (i.e. nucleons) in the nucleus.

Remember! In a neutral atom, the number of protons is equal to the number of electrons to balance the electrical charge on the atom.

Then:-

No. of sub-atomic particles:

No. of protons = 19

No. of electrons = 19 (Same as no. of protons)

No. of neutrons = 39 - 19 = 20

Note:-

The no. of protons is equal to the no. of electrons in an neutral atom but in case of ions and radicals, due to the gain and loss of electrons, the relative number of electrons and protons is unequal..