Question

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

Explanation:

Step1: Recall element - proton relationship

The atomic number of an element is equal to the number of protons in its atom. Here, the number of protons is 11.

Step2: Identify element by atomic number

Looking at the periodic - table, the element with atomic number 11 is sodium, which has the chemical symbol Na.

Answer:

B. Na