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Adams ch 17 vocab
| Question | Answer |
|---|---|
| plasma | a fourth phase of matter in addition to solid liquid, and gass. in the plasma phase, which exists mainly at high temperature, matter consists of positively charged ions and free electrons |
| periodic table | a chart that lists elements by atomic number and by electron arrangements so that elements with the similar chemical properties are in the same column |
| shell model of the atom | a model in which the electrons of an atom are pictured as grouped in concentric shells around the nucleus |
| atomic number | number of protons in the nucleus of an atom. |
| isotopes | 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. |
| protons | a positively charged particle that is one of the two kinds of particles found in the nucleus of an atom |
| neutrons | an electrically neutral particle that is one of the two kinds of particles that compose an atomic nucleus |
| nucleons | the principal building block of the nucleus; a neutron or a proton. |
| chemical formula | a description that used numbers and symbols of elements to describe the proportions of elements in a compound or reaction |
| compound | a cehemical substance made of atoms of two or more different elements combined in a fixed proportion |
| molecule | the smallest particle of substance consisting of two or more atoms of the same or different elements bonded together. |
| brownian motion | the perpetual random movement of microscopic particles suspended in a fluid medium. |
| element | a substance made of only one kind of atom. examples of elements are carbon, hydrogen, oxygen, and nitrogen. |
| atoms | the smallest particle of an element that can e identified with that element. consists of protons and neutrons in a nucleus |
| nucleus | the positively charged center of an atom, which contains protons and neutorns and has almost all the mass of the entire atom but only a tiny fraction of the volume |
Created by:
adamsa
on 2010-09-20