Which of the following statement is true?
(A) The number of electrons in the Mth shell of potassium (19) is 9
(B) Energy is absorbed when an electron jumps from 1st shell to
3rd shell in a H-atom
(C) The physical properties of H, H, H are similar but their chemical
properties are different
(D) An isotope of cobalt is used as a coolant in nuclear reactor.
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Answer:
C is the answer
Explanation:
The statement is true
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