Question

What element is this? How do you know?
Pls help!!

Answer 1

The element is helium.

We know this because if you look at the periodic table, Helium has an atomic number of 2, meaning that it has 2 protons.

To solve for neutrons, we simply subtract the mass by its' number. We can round 4.003 to 4, showing that it has 4 - 2 = 2 neutrons

Answer 2

That element is Helium.