chapter 2
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| matter | anything that has mass and takes up space
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| mass | a measure of the amount of matter in an object; a fundamental property of an object that is not affected by the forces that act on the object, such as a gravitational force
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| element | a substance that cannot be broken down or separated into simpler substances by chemical means; all atoms of an element have the same atomic number
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| atom | the smallest unit of an element that maintains the chemical properties of that element
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| nucleus | in physical science, an atoms central region, which is made up of protons and neutrons
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| proton | a subatomic particle that has a positive charge and that is located in the nucleus of an atom; the number of protons in the nucleus is the atomic number, which determines the identity of an element
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| neutron | a subatomic particle that has no charge, and that is located in the nucleus of an atom
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| atomic number | the number of protons in the nucleus, is the same for all atoms of an element
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| mass number | the sum of the number of protons and neutrons in an atoms nucleus
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| electron | a subatomic particle that has a negative charge
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| orbital | a region of an atom where there is a high probability of finding electrons
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| isotope | an that has the same number of protons (or the same atomic number) as other atoms of the same element do but has a different number of neutrons (different atomic mass)
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| compound | a substance made up of atoms of 2 or more different elements joined by a chemical bond
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| chemical bond | the attraction force that holds atoms or ions together
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| covalent bond | chemical link between 2 atoms in which electrons are shared between them
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| molecule | a group of atoms that are held together by chemical forces; a molecule is the smallest unit of matter that can exist by itself and retain all of a substances chemical properties
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| ion | an atom, radical, or molecule that has gained or lost one or more electrons and has a negative or positive charge
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| ionic bond | the attraction force between oppositely charged ions, which from when electrons are transferred from one atom to another
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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.
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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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