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Chapter 17


the smallest particle of an element that can be identified with that element. Consistes of protons and neutrons in a nucleus surrounded by electrons. atoms
A substance made of only one kind of atom.Examples of elemnets are carbon, hydrogen, oxygen, and nitrogen. Element
the perpectual random movement of microscopic particles suspended in a fluid medium. Brownian motion
the smallest particl of substance consisting of two or more atoms of the same or different elements bonded together. molecule
a chemical substance made of atoms of two or more different elements combined in a fixed proportion. compound
A description that uses numbers and symbols of elements to describe the proportions of elements in a compound or reaction. chemical formula
The principal building block of the nucleus; a neutron or a proton nucleons
An electrically neutral particle that is one of the two kinds of particles found in the nucleus of an atom. neutrons
A positively charged particle that is one of the two kinds of particles found in the nucleus of an atom. protons
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. isotopes
Number of protons in the nucleus of an atom. atomic number
An atom (or group of atoms bound together) with a net electric charge, which is due to the loss or gain of elecrons. ion
A model in which the electrons of an atom are pictured as grouped in concentric shells around the nucleus. shell model of the atom
A chart that lists elements by atomic number and by electron arrangements, so that elements with similar chemical properties are in the same column. periodic table
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 ans free electrons. plasma
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 nucleus
Created by: abbiebender
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