Power Plant Engineering
Atomic number of an element in the periodic table represents the numbers of

Electrons in the atom
Neutrons in the nucleus
Protons in the nucleus
Electrons in the nucleus

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Power Plant Engineering
A nuclear unit becoming critical means

It is generating power to rated capacity
It is capable of generating much more than rated capacity
Chain reaction that causes automatic splitting of the fuel nuclei has been established
There is danger of nuclear spread

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