WarmupWhat do Mg (Magnesium) and Si (Silicon) have in common?

What do Mg (Magnesium) and Sr (Strontium) have in common?

Speculate on which atoms are more chemically similar, and why?

PERIODIC TABLESEPTEMBER 24TH, 2010

GroupsRows on the periodic table are called periods.Rows correlate to the number of electron shells.

Columns on the periodic table are called groups.Groups correlate to the number of valence electrons.

Because all elements in a group have the same number of valence electrons, they behave similarly in chemistry.

Ex: Sodium (Na) does a lot of the same things potassium (K) does.

(both part of salts in your body)

Chlorine (Cl) does a lot of the same things Bromine (Br) does. (both used in swimming pools)

Silicon (Si) does some of the same things carbon (C) does. (both can form very complicated molecules)

Valence Shell to Row CorrespondenceWhich row of the periodic table corresponds to the valence shell of each of these atoms?

K, 19 e-

La, 57 e-

Ac, 89 e-

H, 1 e-

Group NamesAlkali, Alkaline, Transition Metals, Boron, Carbon, Nitrogen, Oxygen, Halogens, Noble or Inert Gases

Practice1) Which elements are often made into coins? Is this a coincidence?

Explain.

2) Phosphorous is an important ingredient in plant fertilizer. What is another important ingredient?

3) Neon goes into neon lights. What else might you be able to make lights out of?

4) Iron, cobalt, and nickel are all easily magnetized materials. Is this a physical or chemical attribute, and why?

Properties of MetalsMalleability – can be hammered into a certain shape, does not shatter or crumbleDuctability – can be drawn into a wireLuster – shininessThermal conductivity – allows heat to flow quicklyElectrical conductivity – allows electricity to flow easilyLow melting point

Non-metals do not have these properties.

Semi-metals, a.k.a. metalloids and semiconductors, are somewhere in-between.

PracticeCreate a table showing the physical properties of metals, metalloids, and non-metals.

Metals Metalloids Non-metals

Malleability

Quiz Topics

History of the atomic model. Atomic number, mass, and nucleus

composition. Pauli exclusion principle, Hund’s rule,

Aufbau principle. Electron orbital maps and diagrams. Wave equation, Planck’s equation,

Rydberg Equation