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B & W Ch 2 Chemistry
elements and the periodic table vocab
| Question | Answer |
|---|---|
| The very small center core of an atom. | Nucleus |
| Small, positively charged particle in the nucleus of the atom. | Proton |
| Small particle in the nucleus of an atom, with no electrical charge. | Neutron |
| Tiny, negatively charged particle that moves around the nucleus of an atom. | Electron |
| The number of protons in the nucleus of an atom. | Atomic number |
| An atom with the same number of protons and a different number of neutrons from the other atoms of the same element. | Isotope |
| The sum of the protons and neutrons in the nucleus of an atom. | Mass number |
| In science, a diagram, mental picture, mathematical statement, or an object that helps explain ideas about the natural world. | Model |
| The average mass of all the isotopes of an element. | Atomic mass |
| A chart of the elements showing the repeating patterns of their properties. | Periodic Table |
| A one- or two letter representation of an element. | Chemical symbol |
| Horizontal rows in the periodic table. | Periods |
| Elements in the same vertical column of the periodic table; also called a family. | Group |
| A class of elements characterized by physical properties that include shininess, malleability, ductility, and conductivity. | Metals |
| A term used to describe material that can be pounded into shapes. | Malleable |
| A term used to describe material that can be pulled out into a long wire. | Ductile |
| The ability of an object to transfer heat or electricity to another object. | Conductivity |
| The ease and speed with which an element combines, or reacts with other elements and compounds. | Reactivity |
| The gradual wearing away of a metal element due to a chemical reaction. | Corrosion |
| Elements in Group 1 of the periodic table. | Alkali Metals |
| Elements in Group 2 of the periodic table. | Alkaline Earth Metals |
| Elements in Group 3 - Group 12 of the periodic table. | Transition Metals |
| A mixture of two or more elements, one of which is a metal. | Alloy |
| A machine that moves atomic nuclei at higher and higher speeds until they crash into one another, sometimes forming heavier elements. | Particle accelerator |
| An element that lacks most of the properties of a metal. | Nonmetal |
| A molecule consisting of two atoms. | Diatomic molecule |
| An element found in Group 17 of the periodic table. | Halogen |
| An element found in Group 18 of the periodic table. | Noble gas |
| An element that has some characteristics of both metals and nonmetals. | Metalloid |
| A substance that can conduct electricity under some conditions. | Semiconductor |
| A state of matter that consists of a gas-like mixture of free electrons and atoms stripped of their electrons. | Plasma |
| The process in which two atomic nuclei combine to form a larger nucleus, forming a heavier element and releasing huge amounts of energy. | Nuclear fusion |
| The cloud-like region of gases left over in the remains of a shrinking, sun-sized star. | Nebula |
| An explosion of a massive star. | Supernova |
Created by:
bwise
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