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Biology 2.1 Vocab

QuestionAnswer
Matter anything that has mass and takes up space
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 gravitational force
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
Atom The smallest unit of an element that maintains the chemical properties of that element
Nucleus in physical science, an atom's central region, which is made up of protons and neutrons
Atomic Number The mass of an atom expressed in atomic mass units
Mass Number the sum of the numbers of protons and neutrons in the nucleus of an atom
Electron a subatomic particle that has a negative charge
Orbital a region in an atom where there is a high probability of finding electrons
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)
Compound a substance made up of atoms of two or more different elements joined by chemical bonds
Chemical Compound Attractive forces that hold atoms together
Covalent Bond A bond formed when atoms share one or more pairs of electrons
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
Ion an atom, radical, or molecule that has gained or lost one or more electrons and has a negative or positive charge
Ionic Bond the attractive force between oppositely charged ions, which form when electrons are transferred from one atom to another
Neutron a nerve cell that is specialized to receive and conduct electrical impulses
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
Created by: kochm20
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