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ASHA 777 [7]
3 years ago
6

What is thermal expansion?

Chemistry
1 answer:
Charra [1.4K]3 years ago
7 0
Thermal expansion<span> is the tendency of matter to change in shape, area, and volume in response to a change in temperature, through heat transfer. Temperature is a monotonic function of the average molecular kinetic energy of a substance. When a substance is heated, the kinetic energy of its molecules increases.</span>
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Answer: The number 4 indicates 4 electrons.

Explanation: We are given an electronic configuration, which is:

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Here,

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Hence, 4 indicates 4 electrons present in 2p sub-shell.

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