Atoms and Elements

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by aaportal
Last updated 6 years ago

Chemical Elements

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Atoms and Elements

There are 116 known elements, which are organized and classified in the Periodic Table. Each element has its own chemical symbol that is used all over the world, for example for Oxygen the chemical symbol is O.According to their properties elements can be grouped into:MetalsNon-metalsEach column contains elements which are similar to each other and is called a group with its number indicated on the top. The rows across are called periods.

Atoms themselves are divided into even smaller parts called sub-atomic particles.

Protons and neutrons are the sub-atomic particles that make up the nucleus of the atom (the centre).Protons have a positiv electric chargeNeutrons have no electric charge.

Everything is made up of atoms.There are over hundred different types of atom. And each type is called an ELEMENT like iron, oxygen or carbon.

Atoms and Elements

Atomic number: number of protons in the nucleus of an atom.A normal atom has the same number of electrons as protons. Therefor you can know the number of electrons in an element looking at its atomic number..

The Periodic Table

Atoms and Elements

A model of an atom

Electrons are the sub-atomic particles that are orbiting around the nucleus. They are negatively charged. That’s way they are attracted by the positive charges in the protons, being held in place.

Atomic number

Sub-atomic particles

The atomic mass of an atom depends on the number of protons and neutrons in the nucleus.Carbon atomic mass = 6 neutrons + 6 protons = 12

Atomic mass


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