Question

the mass number of an element is 18 it contains 7 electrons so what will be the number of proton and neutron in it and what is the atomic number of the element​

Answer 1

Mass=18

No.of e-= 7

No. of protons =no. of electrons=7

No. of neutrons=18-7=11

ATOMIC NUMBER. Z=7

element is nitrogen

Answer 2

Explanation:

Mass number =18

electrons =7

proton =7 (because proton is equal to electron )

Atomic number=7( because proton is equal to its atomic number)

neutron =18-7+7

=4