Question

The structure of the sodium atom is shown in the figure given alongside. Identify the correct statement.

Sodium has atomic no. .........................

• A. 11
• B. 12
• C. 23
• D. 10

Answer 1

The correct option is A 11

Atomic number (z) is the number of protons in an atom. It is also equal to the number of electrons in the atom.

Atomic number = number of protons

So, in this case, the atomic number is $11$ which is equal to no. of protons in the nucleus.