Biology Chapter 2.1 Terms and Conditions
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each of the black spaces below before clicking
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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 the gravititraditional force
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| element | a substance that cannot be separated or broken down 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 atom's 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 of the nucleus is that 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 of an atom; the atomic number is the same for all atoms of an element
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| mass number | the sum of the numbers of protons and neutrons in the nucleus of an atom
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| electron | a subatomic particle that has a negative charge
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| orbital | a region in an atom where there is a high probability of finding electrons
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| isotope | an atom that has the same number of protons (or the same atomic number) as other atoms of the same element do but that has a different number of neutrons (and thus a different atomic mass)
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| compound | a substance made up of atoms of two or more different elements joined by chemical bonds
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| chemical bond | an attractive force that holds atoms or ions together
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| covalent bond | a bond formed when atoms share one or more pairs of electrons
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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 substance's 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 attractive force between two oppositely charged ions, which form when electrons are transferred from one atom to the other
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