Question

all large radioactive atoms decay into smaller atoms by releasing alpha particles. each alpha particle has 2 protons, 2 neutrons, and 0 electrons. the table below describes several neutral, low - mass atoms.

an alpha particle is also referred to as a nucleus of which isotope?
○ lithium - 7
○ helium - 4
○ hydrogen - 2
○ helium - 2

Explanation:

An alpha particle has 2 protons and 2 neutrons. The atomic number (number of protons) of helium is 2. The mass number (protons + neutrons) of an alpha particle is \(2 + 2=4\). So, an alpha particle is the nucleus of helium - 4.

Answer:

helium - 4