atoms and the periodic table chapter three l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
ATOMS AND THE PERIODIC TABLE chapter three PowerPoint Presentation
Download Presentation
ATOMS AND THE PERIODIC TABLE chapter three

Loading in 2 Seconds...

play fullscreen
1 / 35

ATOMS AND THE PERIODIC TABLE chapter three - PowerPoint PPT Presentation


  • 237 Views
  • Uploaded on

ATOMS AND THE PERIODIC TABLE chapter three. FOCUS ACTIVITY 1. ATOMIC THEORY - history. NUCLEUS. PROTON +. NEUTRON (NEUTRAL). ATOMIC THEORY - STRUCTURE MODEL OF THE ATOM. ELECTRON -. ENERGY LEVELS. ATOMIC STRUCTURE ELECTRON LOCATION. Electrons are found in energy levels of an atom.

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

PowerPoint Slideshow about 'ATOMS AND THE PERIODIC TABLE chapter three' - jacob


An Image/Link below is provided (as is) to download presentation

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
atomic theory structure model of the atom

NUCLEUS

PROTON +

NEUTRON

(NEUTRAL)

ATOMIC THEORY - STRUCTURE MODEL OF THE ATOM

ELECTRON -

ENERGY LEVELS

atomic structure electron location
ATOMIC STRUCTURE ELECTRON LOCATION

Electrons are found in energy levels of an atom.

Electrons occupy the lowest energy level available.

Bohr’s Atom and Energy Levels

orbitals where the are located within an energy level
ORBITALS – where the _____ are located within an energy level.

S orbital

(Like a sphere)

may contain up to 2 electrons

first energy level is an s orbital

p orbital
(Like a dumbbell)

may contain up to 2 electrons

second energy level may contain an s orbital and up to 3 p orbitals

P orbital
electrons are located in the outermost energy level of an atom
_____ electrons are located in the outermost energy level of an atom.

They determine the chemical properties of an element.

3 2 a tour of the periodic table
3.2 A TOUR OF THE PERIODIC TABLE
  • Properties of elements change in a regular pattern that the table helps to describe.
  • Periods –
  • Groups(families) -

Los Alamos National Laboratory: Periodic Table

slide16
The number of protons in an atom determines an element’s location on the table.Los Alamos National Laboratory: Periodic Table
slide17

ATOMIC NUMBER

6

C

Carbon

12.001

PROTONS

(and ELECTRONS too)

SYMBOL

NAME

PROTONS

+ NEUTRONS

MASS #

MASS

slide19
MASS 35

ATOMIC NUMBER 17

protons _?_ electrons _?_

neutrons _?_

Cl

ions are atoms that have lost or gained an
ELECTRON GAINED =

NEGATIVE CHARGE

(-)

ELECTRON LOST =

POSITIVE CHARGE

(+)

IONS are atoms that have lost or gained an ___.
slide21

Electron

transfer

Na+

Cl

two kinds of ions
A (+) CHARGED ION IS A ____.

A (-) CHARGED ION IS AN ___.

EXAMPLES:

LITHIUM

FLUORIDE

TWO KINDS OF IONS:
slide23

The atoms of an element always have the same number of protons.BUT…..The atoms of an element may have different numbers of neutrons.This is an ISOTOPE!

Two carbon ISOTOPES:

CARBON 12 = 6 protons and 6 neutrons

CARBON 14 = 6 protons and 8 neutrons

the average mass of an atom
The AVERAGE MASS of an ATOM
  • Why is the mass number not an even number?
    • Atoms of the same element exist with different numbers of neutrons.
    • This makes the mass of different atoms of the same element different.
    • The average mass is a weighted number so that more common isotopes have a greater affect on the average than rare isotopes.
  • What is an amu?
    • It is an “atomic mass unit”.
    • An amu is equivalent to the mass of 1/12 of a carbon-12 atom.
3 3 families of elements
3.3 FAMILIES OF ELEMENTS:
  • HAVE THE SAME VALENCE NUMBER.
  • HAVE SIMILAR CHEMICAL AND PHYSICAL PROPERTIES.
  • A COLUMN OF ELEMENTS IS A FAMILY.
group two alkaline earth metals
GROUP TWO:ALKALINE EARTH METALS
  • TWO VALENCE ELECTRONS
group 3 12 transition metals
GROUP 3-12:TRANSITION METALS
  • MANY COMMON METALS
  • NOT AS REACTIVE AS OTHER METALS
group 17 halogens
GROUP 17:HALOGENS
  • VERY REACTIVE
  • FORM SALTS WITH ALKALI METALS
  • 7 VALANCE ELECTRONS
group 18 noble gases
GROUP 18:NOBLE GASES
  • INERT / UNREACTIVE
  • EIGHT VALENCE ELECTRONS
synthetic elements
SYNTHETIC ELEMENTS
  • They are man-made and radioactive.
  • They include all elements above #92, plus #43 and #61.
semiconductors metaloids

B

Si

Ge

As

SEMICONDUCTORS (METALOIDS).

The elements that are between the metals and nonmetals are known as:

SEMICONDUCTORS (METALOIDS)

They may exhibit metallic and nonmetallic properties.

3 4 using moles to count atoms
3.4 USING MOLES TO COUNT ATOMS
  • Some counting units:
    • Reams of paper
    • Dozens of eggs
    • Atomic mass units of protons and neutrons
    • Moles of atoms
  • A mole is the SI unit that describes the amount of a substance.
  • Avogadro’s constant is the number of particles in one mole which = 6.022 x1023
  • molar mass is the mass in grams of one mol of a substance…it is equal to the average atomic number of an atom.
chapter 3 studying for the test
Chapter 3Studying for the Test
  • Vocabulary
  • Parts of an atom
  • History
  • Element families
  • Using the periodic table
  • Metal vs. nonmetal