HtD

1 100

Note: These numbers are approximate and can vary slightly between individuals.

Electrons: Approximately 7.5 x 10^27 (that's 7.5 followed by 27 zeros)
Protons: Approximately 7.5 x 10^27
Neutrons: Approximately 7.5 x 10^27
Atoms: Approximately 7 x 10^27 (primarily hydrogen, oxygen, carbon, and nitrogen)
Molecules: Trillions upon trillions. Molecules are combinations of atoms, so their exact number is difficult to pin down, but it's incredibly vast.

the estimated number of water molecules in a 180-pound human, based on the that the body is 60% water.

1.64 x 10^27 molecules

1,640,000,000,000,000,000,000,000,000

1.64 quintillion

100 1 0 1 100

Human: 1 ( )

Key points to remember:

Atoms are the building blocks of matter.
Electrons, protons, and neutrons are the subatomic particles that make up atoms.
Molecules are groups of atoms bonded together.