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Biology 2.1 Vocab

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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  


   






 
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