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If molecular mass and atomic mass of sulphur are 256 and 32 respectively, its atomicity is:
(1) 2
(2) 8
(3 )4
( 4)16
Ans: 8
The radius of which of the following orbit is same as that of the first Bohr's orbit of hydrogen atom: (1) He + (n= 2) (2) Li 2+ ( n= 2) (3) Li 2
How many electrons can be accommodated in a sub-shell for which n=3, l=1: (1) 8 (2) 6 (3) 18 (4) 32 Ans: 6
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Each element has a unique number of protons. This unique number is known as the element's atomic number . All atoms of a given element have the same atomic number. For example:
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