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17 Emma Brinson
chapter 17 vocabulary Emma Brinson 9/27/10 period B
| Question | Answer |
|---|---|
| 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. |
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