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Chapter 17 vocabulry

Unruh's Chapter 17 Vocabulary

the smallest particle of an element that can be identified with that element. Consists of protons and neutrons in a nucleus surrounded by electrons atom
a substance made of only one kind of atom. Examples of elements are carbon, hydrogen, oxygen, and nitrogen. element
the perpetual random movement of microscopic particles suspended in a fluid medium browian motion
the smallest particle of substance consisting of two or more atoms of the same or different elements bonded together by sharing electrons 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 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
the pricipal building block of the nucleus; a neutron or a proton nucleon
an electrically neutral particle that is one of the two kinds of particles found in the nucleus of an atom. neutron
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. They differ in the number of neutrons. 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 electrons 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 addittion to solid, liquid, and gas. In the this phase, which exists mainly at high temperature, matter consists of positively charged ions and free electrons. plasma
Created by: unruh