Atoms consist of three sub-atomic particles called protons, neutrons and electrons. Protons and ____ are both found inside the ____ at the centre of the atom. They both have a ____ of 1. Electrons are found orbiting the nucleus in ____. They have a negligible mass. Protons and electrons both have an ____ charge, which is equal and ____ each another. Protons and electrons are attracted to each other, this often influences the ____ of the element. Protons are positively charged and electrons are negatively charged. The number of protons and electrons in an atom is equal, which makes the atom overall ____. The atomic ____ of an element tells us the number of ____ inside the nucleus. The atomic mass tells us the number of protons added to the number of ____. You can easily find the number of neutrons by subtracting the atomic number from the atomic mass. Atoms are most stable when their outer electron shell is ____. This means that they often ____, gain or share electron to form chemical ____. When electrons are gained or lost the particle will be charged, we call this type of charged particle an ____. Metallic elements give away their outer electron to form ____ ions whilst other ____ electrons to form negative ions.

AW Yr 9 - Atomic structure

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