The first three electrons that enter into p orbitals must have a. parallel spins. b. opposite spins. c. low energy levels. d. opposite charges.

Which of the following true? a_volcanoes and earthquakes often near the plate boundaries. b_volcanoes occur whereve there are tall mountains. c_earthquakes cause volcanoes in the same location to erupt violently d_volcanoes and earthquakes occur only where plates are colliding with each other

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

An electron moved from shell n = 2 to shell n = 1. what most likely happened during the transition? a fraction of a photon was added. a photon of energy was absorbed. a fraction of a photon was removed. a photon of energy was released.