Which of the following elements can form double covalent bonds?

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

→

the answer for sodium is 0.186

the answer for rubidium is 0.251

a) the particles of the chair are strongly held together.

idk what the question is about