What is a shorter, easier way to show chemical reactions, using symbols instead of words?

As you move from right to left on the periodic table the atomic radius fill in the blank

Can someone me with questions 12 and 13 plz.

Which statement explains why the bonds between non metals tend to be covalent? the bonds are found to be nondirectional they have large differences in electronegativity they have small differences in electronegativity they have ions that produce an electrostatic pull