How many moles are in 150g of argon gas?

Which best describes why nh4+ can form an ionic bond with ci-?

Why do lunar and solar eclipse not happen every month

In chemistry, the type of an atom (what element it is) is determined by: a) the number of protons it contains in its nucleus.b) the number of neutrons it contains in its nucleus.c) the number of protons it has in a cloud around the nucleus.d) the number of neutrons it has in a cloud around the nucleus.e) the number of electrons it exchanges with its neighbors.