Define Atomic weight.

Define :Atoms

If A,B and C are the three elements of Dobereiner's Traid and atomic weight of A and B are 7 and 15 respectively then the atomic weight of C is:

Assertion: Molecular weight of oxygen is 16. Reason: Atomic weight of oxygen is 16.

If the atomic weight of Zn in 70 and its atomic number in 30 , Then what be the atomic weight of Zn^(2+) ?

If the atomic weight of Zn in 70 and its atomic number in 30 , Then what be the atomic weight of Zn^(2+) ?

Define mass, weight and centre of gravity.

If W is atomic weight and N is the atomic number of an element, then