In an atom, the first energy level can hold electrons. the second energy level can hold electrons. the third energy level can hold electrons.

2, 8, 18

Explanation:

The number of orbitals for any level of interest n is calculated by a formula . Since each orbital contains a maximum of 2 electrons, we can calculate the total number of electrons in an nth orbital by .

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

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