The word "atom" comes from Greek and it means “uncuttable”. It was believed to be the smallest thing is the universe.
Now we know that an atom is made of even smaller particles which probably in the future will be proved to be made of even smaller particles and so on.
Here are 16 interesting facts about atoms.
Everything in the universe is made of atoms.
Atoms can not be seen even with the most advanced microscopes.
Atoms can be study observing their effects.
Every atom contains three basic particles: protons, neutrons, and electrons.
Atoms are not closed, encapsulated, surrounded by a strong shell sphere as it was believed.
Each kind of atom contains the same amount of protons and electrons.
The number of protons in an atom makes the difference between chemical elements and the number of neutrons in the nucleus distinguishes different isotopes of an element.
Atom’s electrons do all the chemical work and they are responsible for chemical reactions. Positive and negative ions exist because of the electrons.
The radius of an atom is one tenth of a billion of meter and a cube of sugar contains as many atoms as stars are in the universe.
The diameter of the biggest atom (cesium) is 9 times bigger than the diameter of the smallest atom (helium).
The nucleus of an atom can be split to form other elements. This is what happens in nuclear reactors and atomic explosions.
Most of the atom’s interior is empty space and 200 electrons can be fit inside of a proton.
99.94% of the entire mass of an atom is contained in the nucleus.
The mass of protons and the mass of neutrons are almost the same.
There are 118 kinds of atoms which can be combined in different ways and create everything is created in the universe.
Atoms exist as electrically neutral (the same number of protons and electrons) or as ions (positive ions – more protons than neutrons;
negative ions – more electrons than protons).