All matter is made up of ____. An atom has a core which is very small and is called the ____ The ____ of an atom holds the ____ and the ____. Protons have a ____ charge. ____ are also found in an atom's nucleus and as the name suggests are ____. That is they have no charge. The number of ____ in an atom's nucleus equals its atomic number. For instance, ____ (H) has 1 proton in its nucleus and therefore has an ____ number of 1. It is the first element listed on the ____ table. Electrons are found orbiting around the nucleus in an electron ____. Electrons have a ____ charge to balance the ____ charge of the protons. The number of electrons always ____ the number of protons. Scientists use atomic ____ to communicate information about an atom. The atomic symbol is made up of three things; the chemical symbol for the atom, the atomic number and the mass number. The ____ number is equal to the number of ____ plus the number of neutrons. For example: Carbon is the letter ____ it has an atomic number of 6, and a mass number of 12. Therefore you can calculate that Carbon has ____ neutrons.

Structure of an Atom

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