Tues., 13 Jan.

• Pick up the 6 pages of notes on the front lab table–Keep the stacks neat please

• You have five minutes to glue them into pages 41L-43R• You need a pen to grade your Frog

Dissection Post-Lab

Periodic Table Notes

What is an atom?• A very small particle that makes up most kinds of

matter• Made up of smaller parts called subatomic

particles: protons, neutrons, and electrons–Protons: positive charge [+]–Neutrons: no charge (or “neutral”) [0]– Electrons: negative charge [-]

• “atom” means “cannot be divided”• 1,000,000 lined up= thickness of a human

hair!

Even though atoms are very small…

• They do have mass- most is found in the nucleus• Nucleus= protons and neutrons inside• Electrons= orbit around the nucleus at great

speeds; have almost no mass

• # Protons= # Electrons

• Atomic number= # protons

Periodic Table Organization

Element NameAtomic Number (# of protons/ electrons)

Element SymbolAtomic Mass

(protons + neutrons)

Periodic Table Organization

• Family/ Groups = Columns

• Period = Rows

Family/ Groups• All elements in the same family/column have

the same number of valence electrons (number of electrons on the outside shell).

Periods• All elements in the same period/row have the

same number of electron shells.

Metals (shaded yellow)

• The periodic table is made up of mainly metals.

• Transition Metals (outlined in red) do not follow the same “rules” so we do not consider them in this class.

Coloring the Periodic TableColor code your periodic table:

Metals = yellow

Metalloids = green

Gas = blue