Atoms and the Periodic Table

1 / 33

# Atoms and the Periodic Table - PowerPoint PPT Presentation

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.

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

## PowerPoint Slideshow about 'Atoms and the Periodic Table' - samson-trujillo

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

### 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

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

### 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?
History of the Atomic Model
• In 1913 Niels Bohrproposed a model of the atom where electrons moved in definite orbits around the nucleus.
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-

### 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 = __