If we say that a substance is negatively charged so that is because of electrons more than protons. And positively charged means protons more than electrons?

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$Y e s, i t m e a n s t h a t i n a n e g a t i v e l y c h a r g e d a t o m t h e r e i s s u r p l u s o f e l e c t r o n s a n d i n a p o s i t i v e l y c h a r g e d a t o m, t h e s u r p l u s o f p r o t o n s .$

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I learnt this in atoms and molecules chapter "Two protons will also tend to repel each other because they both have a positive charge. On the other hand, electrons and protons will be attracted to each other because of their unlike charges."but I have a doubt, that is, if protons can attract electrons,then why electrons in the atom is revolving around the protons and not attracting it.

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If we say that a substance is negatively charged so that is because of electrons more than protons. And positively charged means protons more than electrons?

Yes, it means that in a negatively charged atom there is surplus of electrons and in a positively charged atom, the surplus of protons.

$Y e s, i t m e a n s t h a t i n a n e g a t i v e l y c h a r g e d a t o m t h e r e i s s u r p l u s o f e l e c t r o n s a n d i n a p o s i t i v e l y c h a r g e d a t o m, t h e s u r p l u s o f p r o t o n s .$