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Adv Bio Ch. 2

Matter Anything that takes up space and has mass.
Element Any substance that cannot be broken down to any other substance by chemical reactions.
Compound A substance consisting of two or more different elements combined in a fixed ratio.
Neutron A subatomic particle having no electrical charge.
Proton A subatomic particle with a single positive electrical charge.
Electron A subatomic particle with a single negative electrical charge.
Atomic Nucleus An atom's dense central core, containing protons and neutrons.
Dalton A measure of mass for atoms and subatomic particles.
Atomic Number The number of protons in the nucleus of an atom, unique for each element and designated by a subscript.
Isotope One of several atomic forms of an element, each with the same number of protons but a different number of neutrons thus differing in atomic mass.
Energy The capacity to cause change,especially to do work.
Valence Electron An electron in the outermost electron shell.
Covalent Bond A type of strong chemical bond in which two atoms share one or more pairs of valence electrons.
Electronegativity The attraction of a given atom for the electrons of a covalent bond.
Ion An atom or group of atoms that has gained or lost one or more electrons, thus acquiring a charge.
Hydrogen Bond A type of weak chemical bond that is formed when the slightly positive hydrogen atom of a polar covalent bond in one molecule is attracted to the slightly negative atom of a polar covalent bond in another molecule or in another region of the same molecule
Reactant A starting material in a chemical reaction.
Product A material resulting from a chemical reaction.
Created by: Mr.Devine



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