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atom the smallest particle of an element that can be identified with that element. consists of protons and neutrons in a nucleus surrounded by electrons
element a substance made of only one kind of atom. examples of elements are carbon, hydrogen, oxygen, and nitrogen.
brownian motion the perpetual random movement of microscopic particles suspended in a fluid medium.
molecule the smallest particle of a substance consisting of two or more atoms of the same or different elements bonded together.
compound a chemical substance made of atoms of two or more different elements combined in a fixed proportion
chemical formula a description that uses numbers and symbols of elements to describe the proportions of elements in a compound or reaction.
nucleus the positively charged center of an atom, which contains protons and neutrons and has almost all the mass of the entire atom but only a tiny fraction of the volume.
nucleons the principle building block of the nucleus; a neutron or a proton.
neutrons an electrically neutral particle that is one of the two kinds of particles found in the nucleus of an atom
protons a positively charged particle that is one of the two kinds of particles found in the nucleus of an atom
isotope a form of an element having a particular number of neutrons in the nuclei of its atoms. different isotopes of a particular element have the same atomic number but different atomic mass numbers.
atomic number number of protons in the nucleus of an atom
ion an atom (or group of atoms bound together) with a net electric charge, which is due to the loss or gain of electrons.
shell model of the atom a model in which the electrons of an atom are pictured as grouped in concentric shells around the nucleus.
periodic table a chart that lists elements by atomic number and by electron arrangements, so that elements with similar chemical properties are in the same column.
plasma a fourth phase of matter, in addition to solid, liquid, and gas. in the plasma phase, which exists mainly at high temperature, matter consists of positively charged ions and free electrons.
Created by: knesel
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