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C17
| Question | Answer |
|---|---|
| atom | the smallest particle 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. examples of elements are carbon, hydrogen, oxygen, and nitrogen. |
| brownian motion | the perpetual random movement of microscopic 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 has almost all the mass of the entire atom but only a tiny fraction of the volume. |
| nucleons | the principle building block of the nucleus; a neutron or a proton. |
| neutrons | an electrically neutral particle that is one of the two kinds of particles found in the nucleus of an atom |
| protons | a positively charged particle that is one of the two kinds of particles found in the nucleus of an atom |
| isotope | 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. |
| atomic number | number of protons in the nucleus of an atom |
| ion | an atom (or 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 arrangements, so that elements with similar chemical properties are in the same column. |
| plasma | a fourth phase of matter, in addition to solid, liquid, and gas. in the plasma phase, which exists mainly at high temperature, matter consists of positively charged ions and free electrons. |
Created by:
knesel
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