they say that the red part of watermelon is proton and the seeds are electrons the area of the red part is more than the area covered by seeds how can we say that the electrons and protons are equal


Dear User,

The reference to a water melon has been done not to compare the magnitude of positive and negative charge, but to explain how electrons are distributed in an atom. We are not considering the size of the melon to be equal to the size of the atom. Just like seeds in a water melon are embedded in the red edible part, similarly in an atom, the electrons are studded in the positively charged sphere. Thus the electrons are not present on top of the sphere, or concentrated in one region of the sphere, but distributed all over the positively charged sphere. The total positive charge is equal to the total negative charge, because of which an atom is electrically neutral. 

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 Hi Aagam,

Here the amount of electron & protons are not considering , actually the magnitude of their charge is considering.

Even if their amount / size is varying their magnitude of charges are equal.

Hope you understood this!!!!!

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