Fundemental ideas in Chemistry

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  • Created by: JustTara
  • Created on: 12-02-14 19:24

Atoms C1.1.1

 A substance that is made up of one sort of atom is called an element.

There are about 100 different elements.

Elements that are in the same groups have simillar properties.

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Atoms

Atoms have a central nucleus, which is made up of protons and neutrons and around which there are electrons.

Charge

Protons +1

Neutrons 0

Electrons -1

Atoms have no overall charge as the no. of protons in the nucleus is equal to the no. of electrons.

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Atoms

The number of protons in an atom is it's atomic number.

The sum of protons and neutrons in an atom is it's mass number.

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Atoms- Electronic structure

Inner-shell has a maximum of two electrons.

Other shells have a maximum of eight electrons.

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C.1.2 Periodic Table

Elements in the same group have the same number of electrons in the outer shell.  This gives them similar chemical properties.


The elements in group 0 of the periodic table are called the noble gases. They are unreactive because they have a stable electronic arrangement (full outer shell)

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C1.1.3 Chemical Reactions

When elements react their atoms join together to form compounds. This involves giving, taking or sharing electrons.

The bond between a metal and a non-metal is called ionic.

The bond between two non-metals is called covalent.

No atoms are lost or made during a chemical reaction.

Mass of products equals mass of reactants.

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