Atomic Atomic Structure Structure

NotesNotes20142014

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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

Electron PracticeElectron Practice

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Symbol

Atomic #

Protons

Electrons

MgOAuTi

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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