3rd Nine Weeks BM
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42 Terms
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What do the periods on the periodic table tell you?
number of rings the Bohr model has
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What is an electron dot diagram/Lewis dot structure based on?
the family the atom is in
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What can you predict from an elements location on the periodic table?
non-metal or metal
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What does H2O represent?
chemical formula
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Give an example of **physical** change
color, taste, shape
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Give an example of **chemical** change
flammability
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The number in the chemical formula tells you what? What is that number called? ex MgBr2
how many elements that atom has, aka **subscript**
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Each family in the periodic table has it’s own characteristic properties based on. . .
the number of valence electrons (outer ring on the Bohr model)
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When an atom __**loses**__ an electron, what does it become?
cation
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Polyatomic ions
an ion that contains more than one atom
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Atom
smallest possible unit into which matter can be divided, while still maintaining it’s properties
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2 subatomic particles found in a nucleus?
**pro**tons and **neut**rons
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greatest number of valence electrons an atom can have
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14
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rows across periodic table are called
periods
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chemistry
branch of science that deals with the **identification** of the **substances** of which matter is composed
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matter
anything that has mass and takes up space
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element
substances that can’t be broken down chemically into other substances
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Ernest Rutherford
discovered positively charged nucleus during gold foil experiment
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density
__measure__ of the __amount of matter__ present __in a__ volume of __substance__
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mass number of an element
protons + neutrons
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density of an object
mass divided by volume
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what makes an atom neutral
protons are the same number as electrons
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Mendeleev arranged the first table
increasing atomic mass
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Element location on the periodic table tells you. . .
the properties of the new elements
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What has SIMILAR properties on the periodic table?
elements with the SAME number of valence electrons
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most reactive metals on the periodic table
Lithium and Sodium
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which elements would gain 2 electrons to become stable?
hydrogen, lithium, beryllium
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which elements would have 2 valence electrons?
helium
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what info in the periodic table indicates the number of protons in an atom?
atomic number
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what parts of the atom move around the nucleus
electrons
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how many dots around the **phosphorus** lewis dot structure
5
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noble gases
are the elements that don’t normally form compounds because they are stable
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electrons
subatomic particles that have negative electric charge
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Proton charge
positive
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Neutron (neutral) charge
none
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Electron charge
negative
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Groups/Families 1
Hydrogen
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Groups/Families 2
Beryllium
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Groups/Families 17
Flourine
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Group/Families 18
Helium
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elements in which group are least likely to bond with another atom?
noble gases
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Water density (H2O)
997 kg/m3 **OR** 1 gm/ml
Note 
Flashcards (20)