Do NowDo Now: : Fill in the table belowFill in the table below

00-1-1Outside Outside of nucleusof nucleus

(electron (electron cloud)cloud)

Electron

1100In nucleusIn nucleusNeutron

11+1+1In nucleusIn nucleusProton

MASS(amu)

RELATIVECHARGE

LOCATION(in the atom)

SUBATOMIC PARTICLE

ChemistryChemistry 9/17/139/17/13 Mrs. TurgeonMrs. Turgeon

““Great minds discuss ideas; average Great minds discuss ideas; average minds discuss events; small minds minds discuss events; small minds discuss people.” – Eleanor Rooseveltdiscuss people.” – Eleanor Roosevelt

DO NOW: In your notes, write down DO NOW: In your notes, write down everything you know about an atomeverything you know about an atom

Chemistry 9/18/13 Mrs. Chemistry 9/18/13 Mrs. TurgeonTurgeon

““Do what others won’t to achieve what Do what others won’t to achieve what others don’t” – anonymousothers don’t” – anonymous

DO NOW: In your notes, answer: “What DO NOW: In your notes, answer: “What does the atomic number of an element does the atomic number of an element represent?”represent?”

Honors Chemistry 9/18/13 Honors Chemistry 9/18/13

AGENDAAGENDA

1.1.Finish POGIL worksheet (15 minutes)Finish POGIL worksheet (15 minutes)

2.2.Check-in with the class (spokespersons Check-in with the class (spokespersons be ready to share your group’s answers)be ready to share your group’s answers)

3.3.Start Isotopes POGILStart Isotopes POGIL

YOUR REVIEW OF LIT FOR SCIENCE FAIR YOUR REVIEW OF LIT FOR SCIENCE FAIR IS DUE NEXT WEDNESDAY!!!!!!!!!!!!!!IS DUE NEXT WEDNESDAY!!!!!!!!!!!!!!

Interpretation of a Chemical FormulaInterpretation of a Chemical FormulaSulfuric Acid

H2SO4

Two atomsTwo atomsof hydrogenof hydrogen

One atom One atom of sulfurof sulfur

Four atoms Four atoms of oxygenof oxygen

HH

O

S

OO

O

Models of the AtomModels of the Atom

Dalton’s model (1803)

Thomson’s plum-pudding model (1897)

Rutherford’s model (1909)

Bohr’s model (1913)

Charge-cloud model (present)

Dorin, Demmin, Gabel, Chemistry The Study of Matter , 3rd Edition, 1990, page 125

Democritus’s model

(400 B.C.)

1800 1805 ..................... 1895 1900 1905 1910 1915 1920 1925 1930 1935 1940 1945

1803 John Dalton pictures atoms astiny, indestructible particles, with no internal structure.

1897 J.J. Thomson, a Britishscientist, discovers the electron,leading to his "plum-pudding" model. He pictures electronsembedded in a sphere ofpositive electric charge.

1904 Hantaro Nagaoka, aJapanese physicist, suggests that an atom has a centralnucleus. Electrons move in orbits like the rings around Saturn.

1911 New Zealander Ernest Rutherford statesthat an atom has a dense,positively charged nucleus. Electrons move randomly in the space around the nucleus.

1913 In Niels Bohr'smodel, the electrons move in spherical orbits at fixed distances from the nucleus.

1924 Frenchman Louis de Broglie proposes thatmoving particles like electronshave some properties of waves. Within a few years evidence is collected to support his idea.

1926 Erwin Schrodinger develops mathematicalequations to describe the motion of electrons in atoms. His work leads to the electron cloud model.

1932 James Chadwick, a British physicist, confirms the existence of neutrons, which have no charge. Atomic nuclei contain neutrons and positively charged protons.

+--

--

-e

ee

+

+ +

+

++

++

e

eee

e

ee

Chemistry 9/20/13 Mrs. Chemistry 9/20/13 Mrs. TurgeonTurgeon

DO NOW:

1.In your notes: “Whatdoes the mass number in the Isotopic chemical Symbol represent?”

Chemistry 9/20/13 Mrs. TurgeonChemistry 9/20/13 Mrs. Turgeon

Agenda Agenda

1.1.Review IsoptopesReview Isoptopes

2.2.Review Atom POGILReview Atom POGIL

3.3.Review Beanium LabReview Beanium Lab

IsotopesIsotopes Atoms of the same element with Atoms of the same element with

different mass numbers different mass numbers (because they have different #’s of (because they have different #’s of

neutrons)neutrons)

B115

Mass #

Atomic #

Atomic symbol:Atomic symbol:

Hyphen notation: Hyphen notation: Boron-Boron-1111

Fill in the blanks below…Fill in the blanks below… = proton = neutron (no electrons = proton = neutron (no electrons

shown)shown) # of # of atomic massProtons neutronsnumber number symbolA

B

5 5 5 10

5

B

10

5 6 5 11

5

B

11

Isotopes - practiceIsotopes - practice

Chlorine-37Chlorine-37

atomic #:atomic #:

mass #:mass #:

# of protons:# of protons:

# of electrons:# of electrons:

# of neutrons:# of neutrons:

1717

3737

1717

1717

2020

Cl3717

Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem

Isotope Worksheet

Isotope Worksheet

Isotope Worksheet

9. Which two nuclei are isotopes of each other?

Same element, different mass numbers

Beanium LabBeanium Lab

The 3 Isotopes of Beanium represent The 3 Isotopes of Beanium represent the SAME ELEMENT. They are exactly the SAME ELEMENT. They are exactly the same except for the number of the same except for the number of neutrons!neutrons!

Let’s compare our model (Beans) to a Let’s compare our model (Beans) to a real element (Carbon)real element (Carbon)

Carbon-12 and Carbon-Carbon-12 and Carbon-1414

+

+

+

+

+

+

Nucleus

Electrons

Carbon-12

Neutrons 6Protons 6Electrons 6

+

+

+

+

+

+

Carbon-14

Neutrons 8Protons 6Electrons 6

Nucleus

Electrons

Atomic # C126

Mass #Carbon-12Carbon-12

Atomic # C146

Mass #Carbon-14Carbon-14

Beanium LabBeanium Lab

Let’s do the last problem together.Let’s do the last problem together.

Who wants to share their data?Who wants to share their data?

IONSIONS Ions are atoms that have lost or Ions are atoms that have lost or

gained electrons.gained electrons.

An atom that loses an electron An atom that loses an electron becomes a positive ion becomes a positive ion (CATION)(CATION)

An atom that gains an electron An atom that gains an electron becomes a negative ion becomes a negative ion (ANION)(ANION)

EXAMPLES OF IONSEXAMPLES OF IONS

1.1. A magnesium atom loses two eA magnesium atom loses two e- -

and becomes… and becomes…

2.2. A chlorine atom loses two eA chlorine atom loses two e- - and and becomes… becomes…

3.3. When these two ions bond, what When these two ions bond, what compound is formed?compound is formed?

Magnesium chloride, MgClMagnesium chloride, MgCl22

(more on this next chapter!)(more on this next chapter!)

Mg2+ (a cation)

Cl1- (an anion)

Practice Ions Chart…Practice Ions Chart…Ion Symbol Protons Electrons Charge

S 2- 16 18 - 2K 1+ 19 18 + 1

Ba 2+ 56 54 + 2Fe 3+ 26 23 + 3Fe 2+ 26 24 + 2F 1- 9 10 - 1O 2- 8 10 - 2P 3- 15 18 - 3

HOMEWORK – HOMEWORK –

Read 4-10 & 4-11Read 4-10 & 4-11

#’s 65-73,80-83#’s 65-73,80-83

Study for a possible element Study for a possible element quiz next week!quiz next week!