Question

best trick to know the atomic no. of any elements?​

Answer 1

Explanation:

not any trick , u have to learn them

Answer 2

Answer:

The simplest way to use the periodic table to identify an element is by looking for the element's name or elemental symbol. The periodic table can be used to identify an element by looking for the element's atomic number. The atomic number of an element is the number of protons found within the atoms of that element.

make a table or chart and practice it you will know better my guarantee :)