PHYSICS fill in the blanks.

(protons, positive)
In an atom of an element, the number of electrons is equal to the number of _______________.

(attract, bound)
The electrons revolving close to the nucleus of an atom are called _______________ electrons.

(free, protons)
It is the _______________ electrons in the outermost shell of an atom, which are responsible for electrification

(repel, free)
Similar charges _______________ each other whereas opposite charges _______________ each other.

(protons, positive)
A cat’s skin acquires _______________ charge when rubbed with ebonite rod.