Saturday 23 May 2015

1.5 understand the terms atom and molecule

ATOMS:

- An atom consists of a nucleus which contains protons and neutrons. Around the nucleus are shell(s) which have a certain amount of electrons on them de
pending on how many electrons the substance has.

MOLECULES:

- When atoms join they form molecules. (Remember it can be made from just one element as well as multiple elements). Molecules are only held together by covalent bonds.

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