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17 Emma Brinson

chapter 17 vocabulary Emma Brinson 9/27/10 period B

atoms the smalest particle of an element that can be identified witht hat element; consists of protons and neutrons in the nucleus surrounded by electrons.
elements a substance made of only one kind of atom; examples of elements are carbon hydrogen, oxygen, and nitrogen.
Browian motion the perpetual random movement of microscopic particles suspended in a fluid medium.
molecule the smallest particle of substance consisting of two or more atoms of teh 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 number 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 the entire mass of the entire atom but only a fraction of the volume.
nucleons the principle building block for the neucleus; a neutron or proton.
neutrons an electrically neutral particle that is one of two kinds of particles found in the nucleus of an atom.
protons a positively charged particle that is one of two kinds of particles found in the nucleus of an atom.
isotopes a form of an element having a particular number of nuetrons in the nuclei of its atoms.different isotopes of a particular elementhave the same atomic number but different atomic mass nmbers.
atomic number number of protons in the nucleus of an atom.
ion an atom (or group of atoms bound together) with anet electric charge, which is due to 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 element with similiar chemical properties are in the same column.
plasma the fourth phase of matter; in addition to solid, liquid and gas. In the plasma stage, which exists mainly at high temperatures,matter consists of positively charged ions and free electrons.
Created by: brinson