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Austin
Physics Chapter 17 sAustin
| Question | Answer |
|---|---|
| Atoms | The smallest particle of an element that can be identified with that element. Consists of protons and neutrons surrounded by electrons. |
| Element | A substance made of only one kind of atom. |
| Brownian 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 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 principal building block of the nucleus; a neutron or a proton. |
| Neutrons | An electrically neutral particle thta is one of the 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. |
| 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. |
| Atomic number | Number of protons in the nucleus of an atom. |
| Ion | An atom(or group of atoms bound together) with a net 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 table 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 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. |
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