Atoms and the periodic table
Download
1 / 12

Atoms and the Periodic Table - PowerPoint PPT Presentation


  • 102 Views
  • Uploaded on

Atoms and the Periodic Table. Atoms are the basic building blocks of all matter. Atoms are made up of: Protons—Positively charged particles; found in the nucleus Neutrons—Particles that have no charge; found in the nucleus Electrons—Negatively charged particles; found outside the nucleus.

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' - semah


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

  • Atoms are the basic building blocks of all matter.

  • Atoms are made up of:

    • Protons—Positively charged particles; found in the nucleus

    • Neutrons—Particles that have no charge; found in the nucleus

    • Electrons—Negatively charged particles; found outside the nucleus


Nucleus containing two protons and two neutrons

-

+

+

-

1st energy level containing two electrons



  • Elements are made up of atoms. neutral atom.

  • Elements: substances that cannot be broken down into simpler chemical substances

    • examples: Gold, Iron, and Silver

Atoms of:

ELEMENT

Pure Gold 18-Karat Gold 14-Karat Gold



How to read the periodic table
How to Read the Periodic Table on earth.

  • Chemical Symbol: the letters

  • Atomic Number: found above the chemical symbol

  • Atomic Mass: found below the chemical symbol


two isotopes of Sodium


  • Ions: atoms that gain or lose electrons; have a positive charge (more protons-called a cation) or a negative charge (more electrons-called a anion)

  • Valence Electron Rule (Outermost)

  • 1-3 electrons- lose- positive -cation

  • 4- covalent bond (covalent bond-share a pair)

  • 5-7 electrons – gain- negative - anion

  • 8 –Inert because the atom is full ( Noble gases


Electron shell diagram and electron dot formula
Electron Shell Diagram and Electron Dot Formula charge (more protons-called a

  • 1st electron shell can hold 2 electrons

  • 2nd electron shell can hold 8 electrons

  • 3rd electron shell can hold 8 electrons

1st

2nd

Nucleus

3rd


The first 2 electrons go in the 1st energy level.

The other 4 electrons go in the 2nd energy level.

6 P

6 N

If we have 6 protons in the nucleus, we need to have 6 electrons in the energy levels around the nucleus.


Next, you draw a dot for each electron in the outermost energy level. You can put dots on four sides of the symbol—top, bottom, left, and right. Put the dots in pairs.

C

First, you write the symbol for the element.


ad