How many electrons in a ground-state as atom in the gas
phase have quantum numbers n = 3 and l = 1?
(a) 1 (b) 2 (c) 3 (d) 6

explain why

What the blanks in these lines are ?

What is the molecular formula of ferrous nitrate and ferric nitrate

Which one of the following is an oxidation-reduction reaction? naoh + hno3 --> h2o + kno3 naoh + hno3 --> h2o + kno3 so3 + h2o --> h2so4 cacl2 + na2co3 --> caco3 + 2 nacl ch4 + 2 o2 --> co2 + 2 h2o al2(so4)3 + 6 koh --> 2 al(oh)3 + 3 k2so4