Which of these pairs of elements have the same number of valence electrons? a. phosphorus (p) and chlorine (cl) b. berylium (be) and calcium (ca) c. chlorine (cl) and helium (he) d. oxygen (o) and carbon (c)

How many moles of al3+ ions are in 1.25 moles of al2o3

Which of the following nuclei would be the least stable a 2 protons, 2 neutrons b 1 proton 1 neutron c 1 proton 3 neutrons d 1 proton 2 neutrons

The solid xy decomposes into gaseous x and y: xy(s) m x(g) + y(g) kp = 4.1 (at 0 °c) if the reaction is carried out in a 22.4 l container, which initial amounts of x and y will result in the formation of solid xy?