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Ch11/12KeyTerms AE

QuestionAnswer
Atoms All things around us are made of atoms
Parts of an atom Nucleus (Protons & Neutrons)
Protons Positive Charge
Neutrons No Charge
Charges are attracted to opposites ( - to + and vice versa)
Electrons Negative Charge
Electrons move around in an orbit around the nucleus due to the protons
Electrons are equal to Protons
Electron Mass is smaller than Proton or Neutron
Overall Charge of an atom is neutral
Electrons, Neutrons, and Protons are all subatomic Particles
The Number of Protons determines which atom it is.
Element A substance that cannot be broken down into simpler substances
Pure Substance Matter that has the same chemical composition throughout and cannot be separated into its parts by physical means
An Atom is the small unit of an element that has properties or characteristics of that element.
The number of subatomic particles causes elements to differ.
Atoms bond by sharing or exchanging electrons.
Molecule A Group of two or more atoms held together by very strong chemical bonds
Molecules can be made up of more than one of the same element
Compounds pure substances made of two or more different elements that have been chemically joined.
Compounds can only be separated by chemical means.
The properties of a molecule or compound can differ from the elements that form them.
Periodic Table of Elements Presents and organizes information about all elements
Atomic Number Identifies the number of protons in the nucleus of one atom of an element
Atomic Mass Given in atomic mass units(amu)
Model Any Way to show an object or idea
Period Each Horizontal Row in the Periodic Table
Group A vertical column in the periodic table.
Metals Shiny, malleable, ductile, solid at room temperature, and good conductors of heat and electricity
Nonmetals Mostly gases; Dull, Brittle, poorly conductive of heat and electricity
Metalloids Substances with some characteristics of both metals and nonmetals; Semiconductors
Chemical Property a characteristic that determines how a substance will interact with substances during a chemical reaction.
Reactivity How likely an element is to react and form bonds with other elements.
Ion an atom that has a positive or negative charge.
Inert Unable to react chemically
Alkali metals Soft enough to be cut by a knife; Very Reactive; Soft; Silver-colored; Shiny; Low Density
Alkaline-earth metals Very Reactive, but less than Alkali metals; Silver-colored; more dense than alkali metals
Halogens Very Reactive nonmetals because their atoms need to gain only one electron to have a complete outer level; Poor Conductors of electric current; React violently with alkali metals to form salts; never found uncombined in nature.
Noble Gases Unreactive nonmetals; Unreactive; Colorless, Odorless gasses at room temperature.
Created by: PhySciLewis1
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