Question

define atomic mass and atomic number with example ​

Answer 1

1)the number of protons and neutrons in the atom is called atomic mass

2)the number of protons in the nucleus of an atom, which is characteristic of a chemical element is called atomic number

3)for example in chlorine 35 is atomic mass and 17 is atomic number

Answer 2

hey!

•atomic mass =no of neutrons + no protons

• it is denoted by letter A

( as electrons have negligible mass , so its obvious that protons and neutrons will have mass)

example - chlorine mass is 35.5g

helium mass no is 4 g
_____________________________

•atomic no = no of protons

•no protons = no of electrons (in a neutral atom so we can also write atomic no = no of electrons)

it is denoted by letter Z

eg -

chlorine atomic no is 17

helium atomic no is 2