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gallo chap 17 vocab

atom the smallest particles 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.
Brownian motion the peretual random movement of microscope 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 had almost all the mass of the entire atom only a tiny fraction of the volume.
nucleons the principal buliding block of the nucleus; a neutron or a proton.
neutrons an electrically neutral particle that is one of the two kinds of particles that compose an atomic nucleus.
protons a positively charged praticle that is one of the two kinds of particles found in the nucleus of an atom.
atomic number number of protons in the nucleus of an atom
ion an atom (or a 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 arangements, so that elements with similar chemical properties are in the same column.
plasma a fourth phase of matter in addition to solid. liguid, and gas. In the plasma phase, which exsists mainly at high temperature, matter consists of positively charged ions and free electrons.
Created by: GalloRM