how do u count atoms?

Answer 1

One way to count atoms is by using the molar unit.
Since different atoms have different weights (masses) the molar quantity of different elements will have different weights. However, the molar quantity will have the same number of atoms - 6∙02 x 10^23. This number value is known as Avogadro Constant.

Examples:
Hydrogen: 1 mole = 1g and contains 6∙02 x 10^23 atoms.
Oxygen : 1 mole = 16g and contains 6∙02 x 10^23 atoms.
Water : 1 mole = 18g and contains 6∙02 x 10^23 molecules.

Answer 2

by useing the atomic mass. the atomic mass expressed in grams is one mole. and a mole is an "excact" number of atoms. you'd need a gram scale or balance scale to measure it.

Answer 3

~~~one by one,,,,one atom, two atom three atom and so on,,,