Which of the following elements is an alkaline earth metal?

What are the possible values of l if n = 2?

Identify an anion.

Give the number of core electrons for Cd.

The statement, “In a chemical reaction, matter is neither created nor destroyed” is called

an atom that has lost an electron is

Place the following in order of decreasing IE1. Cs Mg Ar

Calculate the frequency of the red light emitted by a neon sign with a wavelength of 700 nm.

All of the following are SI base units of measurement, EXCEPT

For hydrogen, what is the wavelength of the photon emitted when an electron drops from a 4d orbital to a 2s orbital in a hydrogen atom? The Rydberg constant is 1.097 × 10-2 nm-1.