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Gen.Bio Chapter 2

QuestionAnswer
What is Matter? anything that has mass and takes up space
What is an Element? A pure substance that cannot be broken down into simpler substances
What is a Compund? When 2 or more elements join together with a chemical bond
What four elements make up 96% of all living matter? Nitrogen, Oxygen, Hydrogen, Oxygen
What is an essential element? An essential element that an organism needs to exist, grow, and reproduce EX: Oxygen
What is a trace element? A trace element is something that an organism needs to perform enzymatic, metabolic, and physiological function EX: Iron
What is a neutron? A subatomic particle that has no negative and no positive charge, Its mass is slightly bigger than a proton–found in the nucleus of an atom
What is a Proton? A subatomic particle that has a positive charge–it’s found in the center(nucleus) of every atom.
What is an electron? A subatomic particle that has a negative charge, smallest of the three–circles around the nucleus of the atom. This determines an element's reactivity.
What is atomic mass? Total mass of a single atom
What is an atomic number? How many protons an atom of an element has.
What is an isotope? a variant of a chemical element that has the same number of protons but a different number of neutrons in its nucleus
What is an electron shell fixed energy levels where electrons orbit an atom’s nucleus.
What are radioactive isotopes? It’s an atom with an unstable nucleus that releases energy and particles as radiation to stabilize
What is the only subatomic particle that is directly involved in the chemical reactions between atoms? Electrons determine atomic reactivity.
What is potential energy? Stored energy that is possessed by an object due to its position, state, or configuration relative to other objects.
What determines the chemical behavior of an atom? The number and arrangement of its valence electrons. Electrons in its outermost energy shell.
Created by: ggrandezalicea
 

 



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