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.

Step2: Identify atomic number

The atom has 11 protons, so its atomic number is 11.

Step3: Match atomic number to element

Sodium (Na) has an atomic number of 11.

Answer:

B. Na