Question

How to remember atomic mass of a element ?

Answer 1

Answer:

but every time we can't do the doubling..

like for chlorine , etc..

yaad he krne padenge...

【 :| 】

Answer 2

Explanation:

• There's no need to learn the atomic masses of each and every elements.

• You have to know the atomic masses of first 20 elements, some transition metals, gr 18 elements and some elements like uranium, thorium etc.

• The atomic mass is double the atomic number of an element. But it is not applicable for all the elements in the periodic table.

• The atomic masses of elements like He, Li, C, N, O, Ne, Si, S, Cl, Ca are double the atomic number.

• The atomic masses of elements like Be, B, F, Na, Mg, Al, P, Ar and K are not double the atomic number.

• For these elements just double the atomic number and add 1.

All The Very Best and Good Luck :)