ElementBuilderVocab - Vocabulary Element Builder Vocabulary...

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Vocabulary: Element Builder Vocabulary Atom – the basic unit of matter. o An atom is the smallest particle of an element that still has all the properties of the element. o Atoms are made up of smaller particles called protons , neutrons , and electrons. The smaller electrons orbit around a central nucleus of protons and neutrons. Atomic number – the number of protons in the nucleus of an atom. o Elements are distinguished from one another by their atomic numbers. o For example, any atom with two protons is an atom of helium. o The symbol for the atomic number is Z . o In an element symbol, the atomic number is shown at lower left. Electron – a negatively charged particle that moves around the nucleus. o The mass of an electron is less than one thousandth of the mass of a proton. Electron dot diagram – a diagram that shows the element symbol surrounded by dots representing valence electrons .
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