Question

Are there any trick's to write mass number of elements from 1to 30

Answer 1

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.