Elements are the simplest and purest substances that cannot be broken down further by chemical processes. Atoms are the smallest particles that make up elements and differ in size, mass, and properties depending on the element. Molecules are formed when two or more atoms of different elements bond chemically together to form compounds. Molecules contain atoms in a fixed ratio and are the smallest particles that make up compounds, which can be broken down into simpler substances through chemical reactions. Symbols are used to represent elements, molecules, and chemical properties and reactions.

1. Formulae and
symbols for
atoms and
compounds

2. Elements are pure substances that
cannot be broken into simpler
matter through chemical
processes.

3. • Smallest building blocks of
elements
• Smallest particle
• Identical in a specific element
• Differ in size, mass and properties
in different elements
Atoms

4. • Period 2: 2
orbitals
• 6 protons
• 6 electrons
• 12-6 = 6
neutrons
• Group 4: 4
valence
electrons
+
+
+
+ +
+

5. Symbols and what they tell you:
The element oxygen
2+
2 Two oxygen
atoms bonded
together, forms a
molecule
Electric
charge when
oxygen
accepts e-
Twoseparateparticlesof
whateverfollows.

6. O2-

7. O2-
O2-

8. 2O2-

9. 2

10. 2

11. • Smallest particles of a
compound.
• Two or more atoms that
are chemically bonded
together.
• Molecules of the same
compound are identical.
• Atoms in molecules are in
a fixed ratio.
Molecules

12. Diatomic molecules
Compounds

13. Compounds are
pure substances that
can be
broken/separated
into simpler matter
through chemical
processes.

16. elements Bond to form compounds
Made up of Made up of
atoms Molecules
of
compouds
Molecules of atoms
Chemical bonding

17. Slide 1: http://nurul.kimia.upi.edu/arsipkuliah/web2011/0900721/images/18.png
Slide 2: http://3.bp.blogspot.com/-XArs98-ZAzc/Uaq8qqx9rKI/AAAAAAAADBM/KIsAfqCTD2Q/s1600/Elementos+2.jpg
Slide 3: vid: https://www.youtube.com/watch?v=IixqvhxQMNs gif: http://makeagif.com/2wTBNH
Slide 4: http://sciencenotes.org/wp-content/uploads/2013/06/PeriodicTable-NoBackground2.png
Slide 6 - 8: ion: http://duch.sd57.bc.ca/~rmcleod/Chemists_Corner/Bohr_Chalco_Ion_files/Oxide.jpg
Slide 9: Atoms:
http://biowiki.ucdavis.edu/@api/deki/files/2722/oxygen_molecule,_O2.gif?size=bestfit&width=387&height=213&revision=1
Spacefill model: https://upload.wikimedia.org/wikipedia/commons/c/c0/Oxygen_molecule.png
Slide 10: https://upload.wikimedia.org/wikipedia/commons/c/c0/Oxygen_molecule.png
Slide 11&13: gif: http://makeagif.com/Ogv1rT vid: https://www.youtube.com/watch?v=QqjcCvzWwww
Slide 12: http://s3.amazonaws.com/engrade-myfiles/4005492574704763/compounds_molecules.jpg
Slide 14: http://i0.wp.com/www.sciencemusicvideos.com/wp-content/uploads/2014/07/01_methane-formula-explained.png
Slide 15: http://www.bbc.co.uk/staticarchive/4e1862d0b757481990a81c6eebea40179f88903a.gif