Atoms and the periodic table
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Atoms and the Periodic Table. Chapter 17 Mrs. Gerlach 10-11. Objectives. 17-1 Define and describe protons, neutrons and electrons. (Mass, location, charge) 17-2 Draw a Bohr model showing the correct number and placement of electrons.

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Atoms and the Periodic Table

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Atoms and the Periodic Table

Chapter 17

Mrs. Gerlach 10-11


Objectives

  • 17-1 Define and describe protons, neutrons and electrons. (Mass, location, charge)

  • 17-2 Draw a Bohr model showing the correct number and placement of electrons.

  • 17-3 Know where to find atomic number and average atomic mass for an element on a periodic table.

  • 17-4 Calculate the number of protons, neutrons and electrons for an element.

  • 17-5 Calculate the number of atoms of each element in a chemical compound.

  • 17-6 Differentiate between atoms and isotopes.

  • 17-7 Identify the subatomic particle that determines the identity of the element.


Structure of the Atom

Section 1


Read the story about Atoms Family

  • We will fill in the info when you are done.

  • Jump to notebook


Structure


REVIEW ATOMS FAMILY NOTES!!!


Periodic Table Key

Atomic Number- Tells us the number of protons and electronsthe element has

Symbol

Element’s Name

Atomic mass- subtract atomic number from the atomic mass to get the number of neutrons the element has


Practice

  • Number of Protons?

  • Number of Electrons?

  • Number of Protons?

  • Symbol?

  • Atomic Mass?


Models of Atom

p+

n0


History of the Atomic Model

  • In 1913 Niels Bohrproposed a model of the atom where electrons moved in definite orbits around the nucleus.


Bohr’s Model


Atoms on the PT

  • Atomic number

  • Atomic mass


Drawing an Atomic Model

STEP 1

# of protons

  • Equal to atomic #

    STEP 2

    # of neutrons

  • Equal to:atomic mass (rounded) - atomic #


Drawing an Atomic Model

STEP 3

# of electrons

  • Equal to # of protons

    • 1st energy level holds 2 e-

    • 2nd energy level holds 8 e-

    • 3rd energy level holds 18 e-

    • 4th energy level holds 32 e-


Bohr Model Practice - Lithium


Bohr Model Practice - Sodium


Masses of Atoms

Section 2


VARIATIONS

of an element!

Isotopes

  • DEF: Atoms of the same element have different number of neutrons but the same number of protons and electrons.

  • Have different masses

    • Difference due to number of neutrons


Showing Isotopes

  • Element name – mass number

    • Hydrogen – 1

    • Hydrogen – 2


Mass Number

  • DEF: Sum of protons and neutrons in the nucleus of an isotope

  • Different mass number for each isotope.

  • Based on the Atomic Mass

    • Round to a whole number


Counting Atoms

Section 2


Objectives

  • 17-5 Calculate the number of atoms of each element in a chemical compound.


Compounds have formulas.

H2O

Subscript

  • Applies to the element its attached to

  • May use parenthesis


Compounds have formulas.

7H2O

Coefficient

  • Applies to the FULL formula


CO2

  • How many Carbon atoms are present?

  • How many Oxygen atoms?


3SO4

  • How many Oxygen atoms?

  • How many Sulfur atoms?


Practice!

  • S(H20)2

    • S = __

    • H = __

    • O = __


Practice!

  • 12H2SO4

    • S = __

    • H = __

    • O = __


Practice!

  • 8Na2(OH4)6

    • Na = __

    • H = __

    • O = __


Practice!

  • 10C6H12O6(OH)12

    • C = __

    • H = __

    • O = __


  • 3(Mg,Fe)7Si8

    • Mg = __

    • Fe = __

    • Si = __


  • Periodic Acid – 12H5IO6

    • I = __

    • H = __

    • O = __


THE END!


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