Atoms, Isotopes, and Bohr!
What mak es up an atom?
1. An atom i s m ade up of subatom ic ____________________
(protons, neutrons, and electrons.) Protons and
neutrons are m ade up of Quark s (but m ore on that
later..)
2. An elem ent i s m ade up of the sam e type of ____________.
← Label the parts of the atom in the image to
th e left
What does an atom really look li k e?
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An a tom h as a very den s e cen ter ca lled a
n u cleu s w h ere th e p roton s a n d n eu tron s
a re located. Th e electron clou d is th e
s p ace a rou n d th e n u cleu s . Th e dots s h ow
w h ere a n electron is __________________ to
be.
Parts of the atom
Charge
M ass (am u)
Proton
Neutron
Electron
What holds an atom together?
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Beca u s e p roton s h a ve a pos itive ch a rge a n d electron s h a ve
a n ega tive ch a rge, th ey a re attracted to ea ch oth er beca u s e
of a n electrom a gn etic force (op pos ite ch a rges a ttract,
______________ ch a rges rep el).
Atom Diagrams
1. We dia gram a n a tom with electron s m ovin g in electron
_______________ a rou n d th e n u cleu s .
2. Th e fa rth er a w a y th e electron is from th e n u cleu s , th e
m ore _______________ th e electron h as .
3. Electron s in en ergy levels a re grou p ed in p a irs .
Locati on
Let’s Review
1. What does the atom i c num ber tell you?
2. How do you fi nd the num ber of neutrons?
Isotopes
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An i sotope i s an atom that has the __________
num ber of ____________ , but a _______________
num ber of __________________ .
You can thi nk of i sotopes li k e atom s havi ng
a _______________ or _______________. It i s the
sam e elem ent, just a different versi on of it.
The elem ent doesn’t change because they
have the sam e atom i c _______________ .
How can you tell one isotope from another?
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Although i sotopes share m ost of the sam e physi cal and chem i cal properti es, i sotopes of the
sam e elem ent have _____________________________________________.
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Atom ic M ass = ____________________ + ______________________
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Protons and neutrons have a m ass of about _______________ atom ic m ass uni t (am u)
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Electrons have _______________ m ass that they are consi dered to be 0 (zero) am u.
Atomic M ass
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The total m ass of one atom of an elem ent
Because elem ents have i sotopes, the atom ic m ass li sted on the
peri odi c table i s a _______________ of all the naturally occurri ng
_______________ of an elem ent.
Atomic M ass and Isotopes
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There i s a lot m ore Hydrogen-1 than Hydrogen-2, so Hydrogen-1 i s w ei ghted m ore heavi ly
w hen calculati ng the atom ic m ass of hydrogen
Isot opes of Car bon
M ass: ________ M ass: ________ Mass: ________