I don't know how to find the answer to this question. Can someone please explain how I would find it by looking at a periodic table or something ?Please will give brainliest

3, the answer is 3 i think

Explanation:

if it takes three to bonnd with hydrogen, and phosporus id within hydrogens family, i would think it is also three

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.