Question

The atomic radius decreases in a period due to 

Increase in the nuclear attraction

Decrease in the nuclear attraction

Increase in the number of electrons

Decrease in the number of electrons​

Answer 1

Answer:

Atomic radius decreases across a period because valence electrons are being added to the same energy level at the same time the nucleus is increasing in protons. The increase in nuclear charge attracts the electrons more strongly, pulling them closer to the nucleus.

Explanation:

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Answer 2

Answer:

The atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding shells of electrons. Since the boundary is not a well-defined physical entity, there are various non-equivalent definitions of atomic radius. Four widely used definitions of atomic radius are: Van der Waals radius, ionic radius, metallic radius and covalent radius. Typically, because of the difficulty to isolate atoms in order to measure their radii separately, atomic radius is measured in a bonded state; however theoretical calculations are of course simpler when considering atoms in isolation.

Explanation: