1.Why don't two electrons have same atomic number.
2.How to find the valency of iron with the help of formula.
3.diiferentiate between atomic mass number and mass number.

Dear Student,

1. Electrons do not have atomic number. Atomic number means number of protons in an element.
2. Fe is the formula of iron. You can not find valency from formula of iron. It's atomic number is 26. Valency may be 2 or 3.
3. Atomic mass is the average of masses of all possible isotopes of an element. Mass number is the sum of neutrons & protons.

Regards

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