Question

Sodium is written as 11Na²³ which indicates that it has
(a) atomic number 23 and mass number 23
(b) atomic number 11 and mass number 11
(c) atomic number 11 and mass number 23
(d) atomic number 11 and mass number 34​

Answer 1

Answer:

The atomic number and mass number of sodium are 11 and 23 respectively.

This suggests that number of proton in sodium =11 and number of nucleons i.e. proton and neutrons in sodium =23. Thus, number of neutrons =12 and also Since no. of protons = no. of electrons =11

So, they are similar.