Question

a single atom of an element has 11 protons, 11 electrons, and 12 neutrons. which element is it?
○ v
○ na
○ mg
○ se

Explanation:

The atomic number of an element equals its number of protons. An atom with 11 protons has an atomic number of 11, which corresponds to sodium (Na) on the periodic table.

Answer:

B. Na