All ____ are made of ____. An atom is the smallest part of an ____ that can exist. There are about 100 different elements. Elements are shown in the ____ ____. Atoms are very ____, each atom is only 0.1nm across (0.000 000 000 1 m). There are about 100 trillion (100 000 000 000 000) atoms in each human ____. Each atom is made up of 3 different types of sub-atomic ____; protons, neutrons and ____. The protons and neutrons are in the nucleus and the electrons around the outside of the nucleus, in ____. Atoms have no overall ____ because they have an ____ number of positive and ____ particles. The ____ are positive. The electrons and negative and the ____ have no charge.

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