How many protons are present in an atom which has an atomic number of 36?
Answer in units of protons.

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.

How is the atomic number of a nucleus changed by alpha decay

Covalent bonds generally form when the bonded elements have a difference in electronegativity less than 1.5. subtract the electronegativities for the following pairs of elements and predict whether they form a covalent bond. electronegativity difference of c and c: ionic covalent electronegativity difference of mg and cl: ionic covalent