How many moles of sulfur, S are in 4.00g of sulfur

Which of the following is an example of a parasite?

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.

Ionic compounds are made of ions, and yet the overall charge of an ionic compound is neutral. why?