Question

The atomic number, mass number and number of valence electrons in a carbon atom are respectively :
(A) 4, 6, 12 (B) 12, 6, 4
(C) 4, 12, 6 (D) 6, 12, 4

Answer 1

Answer:

(D) 6,12,4

Explanation:

• Valence electrons means electrons in outer most shell. In carbon it is 4.

• atomic no. is number of protons persent in an atom, In carbon it is 6.
• mass number is proton + neutron, In carbon there is 6 protons and 6 neutrons so, mass no. is 6+6= 12