Alien Insect Periodic Table Each pair has a set of alien insect pictures. Please follow the procedure on pg 370-371. Draw the missing pictures and answer “Analyze and Conclude” questions 7-9 on pg 64 of your ISN. Please write questions 7-9 in your notebook to finish for homework if you don’t get to them!

Do Now Please write HW in your agenda Please update your notebooks Be prepared to discuss last night’s homework! Page # Title Date 71 Periodic Table Basics 12/02/14 72 Study Guide Guide

Periodic Table The periodic table is a chart of the elements arranged into rows and columns according to their physical and chemical properties. Elements are grouped together by their similarities in properties and trends.

Dimitri Mendeleev Dimitri Mendeleev was a Russian chemist who created the earliest periodic table. He arranged the elements in a list using their atomic masses and found that the properties of the elements repeated in a pattern. He used this table to predict the properties of elements that were not discovered yet. Periodic means “repeating pattern.”

Periodic Table Basics Rows on the periodic table are called periods. Columns on the periodic table are called groups or families or groups. Each individual element has an atomic number. This is the number of protons that the atom of this element has. As you move from left to right, and top to bottom, the atomic number and the atomic mass increases.

The Periodic Table of Elements Atomic number increases! Atomic mass increases!

The Periodic Table of Elements Atomic mass increases!

The Periodic Table of Elements Number of valence electrons Electrons in the outermost energy level!

Reading an Element’s Square How do I find… # of protons = atomic number # of electrons = atomic number *in a neutral atom* # of neutrons = mass number - atomic number *round the mass number to the nearest whole number*

Using the Periodic Table Metals, Nonmetals, Metalloids

The Periodic Table The periodic table is sorted by similarities in properties There are three main categories on the periodic table: metals, nonmetals, and metalloids. These categories are broken up into smaller families with more specific properties. (Alkali metals, Halogens, Noble Gases, etc.) Today we’re going to look at the 3 main categories and the properties that they share.

Metals Have luster (shiny) Malleable and ductile High densities and high melting points Good conductors of electricity, but poor insulators Most are solids Examples of families: alkali metals and alkaline earth metals are very reactive.

Nonmetals Have no luster Brittle Good insulators, but poor conductors of electricity Most are gases The elements that make up life are nonmetals (carbon, oxygen, hydrogen) Examples of families: Halogens: Very reactive Noble gases: Nonreactive or inert

Metalloids Have properties of metals and nonmetals Semiconductors: conducts electricity at high temperature, insulates at low temperatures Used in electronic devices Example: Silicon is the most abundant metalloid.

Foldable Cutouts Open your textbooks to pg 348-349. Fill in all atomic numbers and atomic masses for each element on your sheet. Then, cut out each element square. Use the textbook to help you sort each element in their correct category in your foldable(metal, nonmetal, metalloid).