6. What does a numerical subscript following a set of parentheses in a chemical
formula mean?

Which element in the third period would you expect to have the larger atomic radius, sodium (na) or sulfur (s)? a. sodium, because it has a higher effective nuclear charge attracting electrons in fewer energy levels. b. sodium, because it has fewer protons attracting electrons in the same energy levels. c. sulfur, because it has more protons attracting electrons in more energy levels. d. sulfur, because it has a higher effective nuclear charge attracting electrons in the same energy levels.

Consider the elements bromine and chlorine; which elements has a larger ionic radius ?

What will most likely happen when two bromine atoms bond together?