Chemistry, 30.01.2020 07:56 amy290

Which of the following elements share the same number of energy levels?

helium (he) and neon (ne)
potassium (k) and bromine (br)
magnesium (mg) and calcium (ca)
boron (b) and aluminum (al)

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Which of the following elements share the same number of energy levels?

helium (he) and...