CHARGE - Two types: positive and negative; opposites attract, like charges repel, NEUTRON - Uncharged particle found in the nucleus of an atom, ELEMENT - One of more than 100 different substances that cannot be broken down chemically. It contains only one type of atom., ELECTRON - Negatively charged particle that moves rapidly around the nucleus of an atom, ATOM - The smallest particle of an element, NUCLEUS - The centre of an atom. It is composed of protons & neutrons and contains most of the mass., GROUP - A column of the periodic table. Elements in a group have similar chemical properties, PERIOD - A row of the periodic table, ATOMIC NUMBER - Number of protons found in a single nucleus of an atom of an element, PROTON - Positively charged particle found in the nucleus of an atom, SHELL - An energy level in an atom, where the electrons are arranged. Each shell can only have a certain number of electrons., MASS NUMBER - The total number of particles (protons + neutrons) found in the nucleus of an atom, SYMBOL - Letter or letters used to represent an element, PERIODIC TABLE - A table showing all the elements in order of atomic number, and grouping them to show similar chemical properties., VALENCE - The electrons in the outer shell of an atom,

9 Science - Atomic structure and periodic table

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