What must happen for an electron to jump to different energy level?

What must happen for an electron to move to a higher energy level? ... → The electron must transfer some energy to the nucleus. → The electron must absorb light energy.

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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.

i think? ?

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).