Which +2 ion has the same configuration?

What is the maximum number of electrons that can have the following set of quantum numbers? n = 4, ℓ = 3, mℓ = 3, ms = -½

Which of these statements is true concerning the following reaction? Na(g) → Na⁺(g) + e⁻.

If a piece of cadmium (c = .232 J/g°C) with a mass of 37.6 g and a temperature of 100.°C is dropped into 25 g of water at 23°C, what will the final temperature of the system be in °C? 

A 0.50 gram sample of NH4NO3 is added to 35.0 grams of water in a “coffee cup” (constant pressure) calorimeter and stirred until it dissolves. The temperature of the solution drops from 22.7 °C to 21.6°C. What is the HEAT OF SOLUTION of NH4NO3 expressed in kJ/mol NH4NO3?

Which atom(s) would be expected to have a half-filled 4s subshell?

Which neutral atom has the electron configuration 1s22s22p63s23p63d74s2?

Which of the following forms of radiation has the highest frequency?

Which color (frequency) of light travels the fastest in a vacuum?

What is the energy, in J, of light that must be absorbed by a hydrogen atom to transition an electron from n = 3 to n = 6? Submit an answer to three signficant figures.