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- 1C1.1.1 & 1.2All substances are made of atoms. A substance that is made of only one sort of atom is called an element. There are about 100 different elements. Elements are shown in the periodic table. The groups contain elements with similar properties. Protons +ve charge
Neutrons no charge
Electrons -ve charge
NOT FOR IONS- protons = electrons so no overall charge, then electron is lost or gain.
Elements key: Top number = Atomic Number (number of protons) Bottom Number = Atomic Mass (number of protons + neutrons) Shell 1/ 2 electrons
Other shells/8 electrons
All elements want full outer shell
Elements in the same group in the periodic table have the same number of electrons in their highest energy level (outerelectrons) and this gives them
similar chemical properties.
The elements in Group 0 of the periodic table are called the noble gases
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