Define atomic number.

If the atomic number of lithium is 3, then the atomic number of francium will be

If the atomic number if C is 6 , then the atomic number of Sn will be

Derive a relatioship between the atomic number, mass number and number of neutrons in an atom.

The effective atomic number of Rh (atomic number = 45) in the complex is :

Define Mach number

Define isotopes why do isotopes have same atomic number but differente mass numbers? Explain with the help an example.

(a) Define valency of an element. What valency will be shown by an element having atomic number 14 ? (b) What is the relation between the valency of an element and the number of valence electrons in its atoms ? Explain with examples.

Compared with an atom of atomic weight 12 and atomic number 6 , the atom of atomic weight 13 and atomic number 6 .