Question

22 according to the bohr model above, what is the atomic mass of sodium? a 11 b 1 c 23 d 12

Explanation:

Step1: Recall sodium's properties

Sodium (Na) has atomic number 11. Atomic mass is sum of protons and neutrons.

Step2: Know proton - neutron count

Sodium has 11 protons and 12 neutrons. Atomic mass = 11 (protons)+ 12 (neutrons)=23.

Answer:

C. 23