Question

Elements,symbol.atomic mass,atomic no,valency list

Answer 1

ELEMENTS
These are the pure substances present in the earth.

SYMBOL
These are short hand representations for writing names F elements , compounds , reactions , etc.,.

ATOMIC MASS
This is the sum of protons and neutrons in a atom.
This refers to the mass/weight of the atom.

ATOMIC NUMBER
This is the number of electrons/protons in an atom.
The number of protons and electrons are equal except in case of isotopes/isobars.

VALENCY
It is the combining capacity of an element.


- Maheshwaran.