atomic structure notes 2014. 2 atomic structure subatomic particles include ________, _________ and...
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2
Atomic StructureAtomic Structure
Subatomic particles include ________, _________ and _________.
protons
neutronselectron
s________ and _________ are inside the ________
Protons neutronsnucleus
__________ are found __________ the nucleus
Electronsorbiting
Atoms are made up of ________ _________ smaller
particles
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Atomic PiecesAtomic Pieces
Protons have a _________ charge and a mass of ________.
Neutrons have a _________ charge and a mass of _________.
Electrons have a __________ charge and a mass that is so ______ that we consider electrons to have ____ mass!
positive1 AMU (Atomic Mass Unit)
neutral1 AMU
negative small
“NO”
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Element SymbolsElement Symbols
Every element has a _______ on the Periodic Table.
symbol
The symbol is either 1 or 2 letters, where the first is always a ________ letter, and the second is always a _____ letter…
capital
small
H He C Ca
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Atomic NumberAtomic Number
Elements in the Periodic Table are organized by _______ _______.Atomic number
The atomic number is the same as the number of ________.protons
Every element has a _________ number of protons, and therefore a ________ atomic number.
different
different
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Number of PiecesNumber of Pieces
In a ________ atom, the number of _______ always equals the number of __________.
neutralprotonselectrons
#P = #E
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Atomic MassAtomic Mass
How do you find the _____ of an atom?
mass
(________ have mass, _________ have mass, _________ have ____ mass.)
Protons neutronselectrons “NO”
Since protons and neutrons are the only particles that have mass, ____ them together to find the atom’s mass.
add
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Element SymbolsElement Symbols
Element symbols contain the atomic number, mass number and element symbol.
X Massnumber
Atomicnumber
Element symbol
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Number of NeutronsNumber of Neutrons
If you know the atomic number and the atomic mass of an element, you can find the number of _________.
neutrons
Mass - #P = #N
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Examples:Examples:
• Find the Find the
– number of protonsnumber of protons
– number of neutronsnumber of neutrons
– number of electronsnumber of electrons
– Atomic numberAtomic number
– Mass NumberMass Number
– NameName
Na2311
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Examples:Examples:
Find the Find the
–number of protonsnumber of protons
–number of neutronsnumber of neutrons
–number of electronsnumber of electrons
–Atomic numberAtomic number
–Mass NumberMass Number– NameName
Br80 35
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Examples:Examples:
If an element has an atomic number If an element has an atomic number of 34 and a mass number of 78 of 34 and a mass number of 78 what is the what is the –number of protonsnumber of protons–number of neutronsnumber of neutrons–number of electronsnumber of electrons–Complete symbolComplete symbol– NameName
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