
Concept explainers
Interpretation:
The reason due to which electrons are confined in a space surrounding the nucleus needs to be explained.
Concept introduction:
There is always an electrostatic force between two charges. This force can be repulsive or attractive depending on the charges.

Answer to Problem 54A
Attractive electrostatic force between nucleus and electrons keeps electrons confined in the space around the nucleus.
Explanation of Solution
Two charges always have an electrostatic force between them, if the two charges are similar, i.e., positive-positive or negative-negative repulsive electrostatic force generate between them and if both are different, i.e., positive-negative then attractive electrostatic force develops between them. Electrons are negatively charged and nucleus are positively charged so, the electrostatic force generated between them will be attractive electrostatic force. This attractive electrostatic force keeps electrons bind to nucleus of an atom.
Electrons are bind to nucleus due to attractive electrostatic force.
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