15. a- if an Lithium (atomic number 3) atom has a -2 charge, how many electrons does it have? - Why do you do it this way? - Is this an anion or a cation? d- Why? A-
B-
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According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?

Which statement best describes the superposition principle? a.) if two in-phase waves arrive simultaneously at a point, their amplitudes add up b.) if two out-of-phase waves arrive simultaneously at a point, their amplitudes add up c.) if two in-phase waves arrive at a point one after another, their amplitudes add up d.) if two out-of-phase waves arrive at a point one after another, their amplitudes adds up

At the negative terminal of the battery the electron has electric potential energy. what happens to this energy as the electron jumps from the negative to the positive terminal?