Question

An element with an electronic configuration 2, 8, 3 has 16 neutrons.

Its mass number is _____________________. [13/27/29]​

Answer 1

Answer:

27

Element name is Aluminium

Answer 2

Answer:

mass number is number of protons + number of neutrons

so here electronic configuration tells number of electrons are 2+8+3=13

so number of protons will also be 13

and number of neutrons is given 16

so mass number number will be 16+13=29