Which element has the same number of energy levels as krypton (kr) and the same number of valence electrons as nitrogen (n)?

my answer is arsenic (as) is that right?

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)

Why is permeable soil best for plants that need a lot of drainage?

Consider this initial-rate data at a certain temperature for the reaction described by