Question

A sodium atom contains 11 electrons. what is the atomic number of sodium? ​

Answer 1

Answer:

Atomic number for sodium is 11. The mass number is the sum of the neutrons and protons in an atom. Even 11 protons + 12 neutrons= 23. The Atomic number is simply the proton number as well as the atomic number is always seen at the bottom left corner in a element of a periodic table.

Answer 2

The atomic number refers to the number of protons in an atom.

Also, the number of protons and electrons are equal in a atom. Thus, the atomic number of sodium is 11.