Chemistry
The chemical bahaviour of an atom depends upon

The number of protons in its nucleus
The number of neutrons in the nucleus
The number of electrons orbiting around the nucleus
The number of nucleons in the nucleus

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Chemistry
Sodium vapour lamps glow with yellow colour. This is due to

Its ability to absorb all other colours except yellow
The emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum
sublimation of sodium to emit yellow colour
The low ionisation energy of sodium

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Chemistry
Assertion (A) : Synthetic detergents can lather wen in hard water.Reason (R) : Synthetic detergents form soluble calcium and magnesium salts with hard water.

A is true but R is false
A is false but R is true
Both A and R is true and R is the correct explanation of A
Both A and R is true but R is not a correct explanation of A

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