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The mass number is equal to

How many different values of l are possible in the third principal level?

an atom that has lost an electron is

Give the number of valence electrons for Cd.

On the electromagnetic spectrum, visible light is immediately between two other wavelengths. Name them.

Predict the charge that a calcium ion would have.

Which of the following quantum numbers describes the size and energy of an orbital?

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.

Calculate the wavelength (in nm) of the light emitted by a neon sign with a frequency of 4.60 × 1014 Hz.

Choose the one set of quantum numbers that contains an error.