Write the equilibrium expression for Kc for the following reaction: 2H202 (g) = 2H20 (g) + O2 (g)

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.

Idon’t know how to solve this question

What is the maximum number of electrons that an atomic orbital can contain?