Unit 1 Vocabulary Atom – smallest particle of an element that maintains the properties of that element Atomic mass – average mass of one atom of an element.

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Presentation transcript:

Unit 1 Vocabulary Atom – smallest particle of an element that maintains the properties of that element Atomic mass – average mass of one atom of an element (from particles in the nucleus) Atomic number – the number of protons in the nucleus of an atom; used to determine an element's position in the periodic table Electrical charge – a property of a subatomic particle; positive (protons), negative, (electrons), or neutral (neutrons) Electron – a negatively charged particle in the electron cloud surrounding the atomic nucleus Electron cloud – the negatively charged space containing electrons that surrounds the atomic nucleus Neutron – a (neutral) particle with no electrical charge within the atomic nucleus Nucleus – the positively charged center of an atom containing the protons and neutrons Periodic table – a conceptual model in which the elements are organized according to their properties; often displayed as a chart Proton – a positively charged particle within the atomic nucleus; used to identify an element Subatomic particle – a particle smaller than an atom, such as a proton, neutron, or electron Valence electron(s) – electron(s) located in outer energy level (electron shell)