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B2 Ch 3 Lesson 1

Intro to Atoms

Element A pure substance that cannot be broken down into any other substances by chemical or physical means.
Molecule A group of two or more atoms held together by chemical bonds.
Atom The basic particle from which all elements are made; the smallest particle of an element that has the properties of that element.
Electron A tiny, negatively charged particle that moves around the outside of the nucleus of an atom.
Nucleus The central core of an atom which contains protons and neutrons.
Proton Small, positively charged particles that are found in the nucleus of an atom.
Energy Level A region of the atom in which electrons of the same energy are likely to be found.
Neutron A small particle in the nucleus of the atom, with no electrical charge.
Atomic Number The number of protons in the nucleus of an atom.
Isotopes An atom with the same number of protons and a different number of neutrons from other atoms of the same element.
Mass Number The sum of protons and neutrons in the nucleus of an atom.
Created by: Juchrin