Which of the following are correct statements about the way an atom is put together?
Check all that apply.
A. The valence shell is the innermost shell of electrons in an atom.
B. Electrons are found in the nucleus of an atom.
O C. There are two electrons in all electron shells.
O D. Electrons are in layers around the nucleus.
multiple choice

What is the frequency of a light wave with a wavelength of 620nm

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