Phosphorus nuclei has atomic number 15 and mass number is 32, after nuclear decay it changes into sulfur whose mass is also 32 but atomic number changes to 16-what kind of decay is this ?

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

"hydrogen bonding is the attraction of h atoms in the water molecule (slight + charge) to o atoms in a neighboring water molecule (slight - charge); it is a weak interatomic force. but it is still strong enough to the water molecules "stick" together."

try answer.com that works for me