Multiple choice general knowledge science & technology alpha particle is _ . helium atom with two neutron removed helium atom with two proton removed helium atom with two electron removed helium atom with one electron removed Reveal answer Fill a bubble to check yourself C Correct answer Explanation An alpha particle is a helium nucleus, consisting of 2 protons and 2 neutrons. It's essentially a helium atom that has lost both electrons (not just one). Alpha particles are emitted in alpha decay and have a +2 charge.