'An atom of this No. 2 elment has an alpha particle as its nucleus'
helium
MAYBE YOU HAVE TO BE A NUCLEAR PHYSICIST: An atom of this No. 2 elment has an alpha particle as its nucleus
An atom of this No. 2 elment has an alpha particle as its nucleus
An atom of this No. 2 elment has an alpha particle as its nucleus
MAYBE YOU HAVE TO BE A NUCLEAR PHYSICIST
helium
MAYBE YOU HAVE TO BE A NUCLEAR PHYSICIST