Question

Q17.(i) Identify the reason for the decrease of atomic size in the period-
(a) New shells are being added which increase the distance between outermost
electrons and nucleus.
(b) Increase in nuclear charge tends to pull electrons closer to the
nucleus.
(c) Electronegativity increases from left to right in period. (d) valency is different for all elements in the group.​

Answer 1

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Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact.

Answer 2

Explanation:

increase in nuclear charge tends to pull electrons closer to the nucleus.