Question

Should we memorize Mendeleev's periodic table for class 10 CBSE board exam?

Answer 1

no need to memorize the whole table. it is given obly for understanding. thing to remember is to remember the concept on which his table was made

Answer 2

No you only need to learn atomic numbers of first 30 elements along with its period no.and group number.

I think you should be able to find period number and group number of any element from its atomic number.
If you don't know how

Here's I'm telling you

First do electronic configuration of the atomic number...!!!

For e.g.,
Take Na (Sodium)
Atomic no. 11
E.c = 2,8,1

So last shell has 1 electron
Therefore, 1 is its group number

And there are total 3 shells
Therefore, 3 is its period number