An atom has a total of 3 electrons. There are 2 electrons in the first level and 1 electron in the second level. How many VALENCE electrons does it have?

It has one valence electron.

Explanation:

number of electrons in the last shell is number of valence electrons.

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? ?

answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;