Question

Give their definition
Atomic number,Isotopes, valency​

Answer 1

Answer:

atomic number is the number of protons,

isotopes : elements having same atomic number but different structural number

valency: it is the calculated by the electrons in the outer most shell , valency can be +ve or -ve

Answer 2

Answer:

1. Each element in the periodic table is represented by an atomic number that is equal to the protons present in the element.
2. Isotopes of a given element have the same number of protons but different numbers of neutrons in each atom, making their structures different to each other.
3. Valency is simply the combining capacity of an element or how many more electrons it can share that are present in it's outermost shell.