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Essmyer Ch.17 Vocab

the smallest particle of an element that can be identified with that element. Consists of protons and neutrons in a nucleus surrounded by electrons. atoms
substance made of only one kind of atom. Examples are carbon, hydrogen, oxygen, and nitrogen. element
the perpetual random movement of microscopic particles suspended in a fluid medium. Brownian Motion
smallest particle of substance consisting of two or more atoms of the same or different elements bonded together. molecule
chemical substance made of atoms of two or more different elements combined in a fixed proportion. compound
description that uses numbers and symbols of elements to describe the proportions of elements in a compound or reaction. chemical formula
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
principle building blocks of the nucleus; a neutron or a proton. nucleons
electronically neutral particle that is one of two kinds of particles found in the nucleus of an atom. neutrons
positively charged particle that is one of the two kinds of particles found in the nucleus of an atom. protons
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 bonded together with a net electric charge, which is due to the loss of gain of electrons. ion
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
fourth phase of manner, 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. plasma
Created by: essmyer