Which of these elements has two valence electrons? hydrogen (h) barium (ba) nitrogen (n) krypton (kr) bromine (br)

Use the periodic table to determine the electron configuration of dysprosium (dy) and americium (am) in noble-gas notation.

Sulfuric acid is a polyprotic acid. write balanced chemical equations for the sequence of reactions that sulfuric acid can undergo when it's dissolved in water.

Nitrogen dioxide decomposes according to the reaction 2 no2(g) ⇌ 2 no(g) + o2(g) where kp = 4.48 × 10−13 at a certain temperature. if 0.70 atm of no2 is added to a container and allowed to come to equilibrium, what are the equilibrium partial pressures of no(g) and o2(g)