Question of the Day

1. Put the following in chronological order (use your notes if needed):

discovery of neutron, Thomsen, Alchemists, Bohr, discovery of nucleus

Day 4 11-22

Parts of Atoms, Isotopes, and Ions

• Isotopes

–Atoms of one element

•Same number of _______

•Different numbers of ________

•Different ______

protonsprotonsneutronsneutrons

massesmasses

Parts of Atoms, Isotopes, and Ions

• Ions

–________ atoms that have gained or lost ________

–Examples

• Iron loses 2 electrons

•Chlorine gains 1 electron

ChargedChargedelectronselectrons

FeFe +2 +2

ClCl -1 -1

Parts of Atoms, Isotopes, and Ions

Fundamental parts of atoms

COMPONENTCHARGE

APPROXIMATE MASS (in amu)

LOCATION IN ATOM

electroelectronn

- 1- 1 0.000550.00055

shellshellss

protonproton + 1+ 1 1.0 1.0 nucleusnucleus

neutronneutron 00 1.000551.00055 nucleusnucleus

Question of the Day

1. What is the nuclear symbol for an atom with 8 protons, 7 neutrons, and 10 electrons?

Day 5 11-25

Question of the Day

1. What is the nuclear symbol for an atom with 9 protons, 10 neutrons, and 10 electrons?

Day 6 12-3

Parts of Atoms, Isotopes, + Ions

–Individual _____ of any element

–Represented with a _______ symbol

XXAA

ZZ

CC

atomatomnuclearnuclear

element symbolelement symbolmass numbermass number

atomic numberatomic number

•X = _______ _______

•A = ____ _______

•Z = ______ _______

Parts of Atoms, Isotopes, and Ions

•X = _______ _______

•A = ____ _______

•Z = ______ _______

= ______ _______

•C = ______ __ __ ___

•# neutrons = ___ - ___

•# electrons = ___ - ___

XXAA

ZZ

CCelement symbolelement symbolmass numbermass number

atomic numberatomic numberprotons protons numbernumber

charge as an ioncharge as an ionAA ZZ

ZZ CC

Parts of Atoms, Isotopes, and Ions

XX1919 1-1-Mass number?Mass number?

Atomic number?Atomic number?

# of neutrons?# of neutrons?

Element?Element?

Charge?Charge?

# of electrons?# of electrons?

99

• Nuclear Reactions

–What forces act in the atom?

•______ _______ force holds _______ together

•_____ _______ force causes ___________

–Natural radioactivity, radioactive decay, or nuclear disintegration is the ___________ …

Strong Strong nuclearnuclearprotonsprotons

Weak nuclearWeak nuclearradioactivityradioactivity

spontaneousspontaneous

Particles of Radioacty. + Nuc. Rxns.

• Nuclear Reactions

–Natural radioactivity, radioactive decay, or nuclear disintegration is the ___________ … ________ of ________ from an element due to instability of the _______.

spontaneousspontaneousradiationradiation

nucleusnucleus

emissionemission

Particles of Radioacty. + Nuc. Rxns.

• Nuclear Reactions

–Problems in nuclear stability occur when there are too few or too many ________.

–All elements with an atomic number greater than ___ are radioactive.

neutronsneutrons

8383

Particles of Radioacty. + Nuc. Rxns.

Protons

Bohr’s model

Gamma rays

Nucleons

Plum Pudding model

Quarks

Neutrons

Beta particles

Electron cloud

Atom

Dalton

Gold Foil Experiment

Question of the DayUse the nuclear symbol below to fill

in the blanks:

mass # = ____

atomic # = ____

# of neutrons = ____

# of electrons = ____SS

3333

1616

-2-2

33

1617

18

Day 1 12-4