An atom is electrically neutral. But the...

An atom is electrically neutral. But the electrons present in it are negatively charged particles. If only negative charges were present, the atom would not be neutral.Then, why are atoms considered to be neutral ?

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Consider a neutral conducting sphere. A positive point charge is placed outside the sphere. The net charge on the sphere is then

Negative and distributed uniformly over the surface of the sphere .

Negative and appears only at the point on the sphere closest to the point charge

Negative and distributed non - uniformly over the entire surface of the sphere

Zero

Addition of second electron to a neutral atom is always

endothermic

exothermic

sometimes exothermic, sometimes endothermic

none.

Consider a neutral conducting sphere. A positive point charge is placed outside the sphere. The net charge on the sphere is then,

negative and distributed uniformly over the surface of the sphere .

negative and appears only at the point on the sphere closest to the point charge .

negative and distributed non - uniformly over the entire surface of the sphere