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if an atom has 16 protons, 12 neutrons, and 18 electrons, what is the atom's electrical charge?

a. +4

b. -6

c. -2

d. +6

explain and show how you got the answer, i don't get how to do these.

Anne applies a force on a toy car and makes it move forward. what can be said about the forces acting on the toy car at the moment anne applies the force?

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Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is