Question

Which element has 4 neutrons?

Answer 1

Answer:

Lithium

Explanation:

Lithium has four neutrons.

and

Lithium has three protons.

Answer 2

Answer:

beryllium

Explanation:

The element with atomic number 4 is beryllium, which means each atom of beryllium has 4 protons. A stable atom would have 4 neutrons and 4 electrons. Varying the number of neutrons changes the isotope of beryllium, while varying the number of electrons can make beryllium ions.