Chapter 3 - THe Periodic table
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| k;',atomic mass | The average mass of one atom of an element.
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| periodic table | A chart of the elements showing the repeating pattern of their properties.
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| nucleus | The central core of an atom containing protons and usually neutrons.
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| proton | A small, positively charged particle in the nucleus of the atom.
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| neutron | A small particle in the nucleus of the atom, with no electrical charge.
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| electron | A tiny negatively charged particle that moves around the nucleus of an atom.
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| atomic mass unit | A unit used to measure the mass of particles in atoms; a proton or neutron has a mass of 1 amu.
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| atomic number | The number of protons in the nucleus of an atom.
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| chemical symbol | A one- or two-letter representation of an element.
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| group | Elements in the same vertical column of the periodic table; also called a family.
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| family | Elements in the same vertical column of the periodic table; also called a group.
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| period | A horizontal row of elements in the periodic table.
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| valence electron | One of the electrons farthest away from the nucleus of the atom; these electrons are involved in chemical reations.
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| malleable | A term used to describe material that can be hammered or rolled into shape.
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| alloy | A mixture of two or more metals.
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| ductile | A term used to describe a material that can be pulled out into a long wire.
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| alkali metal | An element in Group 1 of the periodic table.
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| conductor | A substance that transmits heat or electricity easily.
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| alkaline earth metal | An element in Group 2 of the periodic table.
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| magnetic | A characteristic of those metals that are attracted to magnets and can be made into magnets.
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| transition metal | An element in Groups 3 through 12 of the periodic table.
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| reactivity | The ease and speed with which an element or compound combines with other elements and compounds.
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| lanthanide | An element in the first row of the rare earth elements in the periodic table.
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| corrosion | The gradual wearing away of a metal element due to a chemical reaction.
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| actinide | An element in the second row of the rare earth elements in the periodic table.
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| nonmetal | An element that lacks most of the properties of metals.
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| diatomic molecule | A molecule composed of two atoms.
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| halogen family | The elements in Group 17 of the periodic table.
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| noble gas | An element in Groups 18 of the periodic table.
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| metalloid | An element that has some of the characteristics of metals and some of the characteristics of nonmetals.
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| semiconductor | An element that con conduct electricity under some conditions.
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| plasma | A state of matter in which atoms are stripped of their electrons and the nuclei packed closely together.
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| nuclear fusion | The process in which smaller nuclei combine into larger nuclei, forming heavier elements.
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| supernova | An explosion of a massive star.
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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