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Chemistry

QuestionAnswer
Atom The smallest particle of an element, made of electrons, protons, and neutrons
Nucleus The tiny, very dense, positively-charged region in the center of an atom; made up of protons and neutrons
Electron cloud The area surrounding the nucleus of an atom where the electrons are found
Electrical charge A property of matter; electrons are negatively charged; protons are positively charged; the numbers of protons and electrons in a material determine the charge of the material
Proton A positively-charged subatomic particle of the nucleus of an atom that contributes to the mass of the atom
Neutron A subatomic particle of the nucleus of an atom that is without charge that contributes to the mass of an atom
Electron A negatively-charged subatomic particle that orbits the atomic nucleus
Subatomic Particles Particles that are smaller than the atom
Element A pure substance that cannot be separated into simpler substances by physical or chemical means.
Atomic Number The number of protons in the nucleus of a single atom.
Chemical Symbol A one or two letter notation used to represent an atom of a particular element
Atomic Mass The mass of an atom, approximately equal to the number of protons and neutrons in the atom
Groups The columns on a Periodic Table that arrange the elements by the number of electrons that are in the outermost shell
Periods The rows in a Periodic Table that classify the elements by the number of electron shells
Metal Most elements are metals. They are typically solid, shiny, malleable, and good conductors of heat and electricity
Non-metal Elements typically not shiny, usually a gas or brittle solid, not malleable, and poor conductors of heat and electricity
Metalloids Elements that have properties of both metals and non-metals; sometimes referred to as semiconductors
Noble Gases Unreactive non-metals in Group 18 of the Periodic Table
Electron Shell A specific area where electrons of the same energy level are found
Valence Electrons The electrons in the outermost energy level of an atom that influence how an element will react with other substances
Energy level A state in which matter can exist with a quantifiable amount of energy and distinct from other states with different amounts of energy
Reactivity Rate at which a chemical substance tends to undergo a chemical reaction; significantly influenced by valence electrons of the reacting substances
Outermost Electron Cloud The area surrounding the nucleus of an atom where the electrons are found
Net charge The sum of negative and positive charges
Ions Form as a result of the loss or gain of electrons and are identified by the overall net charge.
Chemical Reaction The process by which one or more substances change to produce one or more different substances.
Precipitate A so;id that is deposited from a solution
Endothermic A process that absorbs heat
Exothermic A process that releases heat
Chemical Formula A shorthand notation that uses chemical symbols and numbers as subscripts to represent the type and number of atoms that are present in the smallest unit of the substance
Reactants A substance that takes part in and undergoes change during a reaction
Products Substances produced during chemical reactions
Created by: doerre0929
 

 



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