Answer:
Helium (He)
Step-by-step explanation:
An atom with two protons is always a helium atom. Hydrogen atom regards to atoms with 1 proton. If scientists count four protons in an atom, they know it's a beryllium atom. An atom with three protons is a lithium atom, an atom with five protons is a boron atom, an atom with six protons is a carbon atom, etc.