The periodic table is a list of the elements. Each element is one type of atom. Atoms are represented by chemical symbols, e.g O for Oxygen. The elements in the periodic table are arranged in columns, called groups. The elements in a group usually have similar properties.
Atoms have tiny nucleus surrounded by electrons. When elements react, their atoms join with atoms of other elements.Compounds are formed when two or more elements combine together.
The nucleus at the centre of an atom contain two types of particle, protons (Posotive Charge) and neutrons (No Charge).
the number of protons in the nucleusdetermines which element the atom is. We can find the number of protons, neutrons and electrons in an element using the periodic table.
The number above the element is the 'Mass Number' = Protons and neutrons and the number below is the 'Proton Number' = Protons.
In an atom the number of electrons is always the same as the number of protons. This is so the positive and negative charges cancel out.
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