Groups/Families on the Periodic Table (PART ONE) August 15, 2012
Catalyst • Mystery Elements! Use your periodic table and the clues below to determine the identity of 2 mystery elements: • This element is located in Group 1 and Period 2 of the periodic table. It is an ingredient in batteries. 2. This element is located in Group 2 and Period 7 of the periodic table. It is radioactive and was discovered in 1898.
Objectives • I can compare and contrast properties of metals, nonmetals, and metalloids (semimetals). • I can locate metals, nonmetals, and metalloids (semimetals) in the Periodic Table.
Agenda • Catalyst • Notes: Properties of Metals, Non-metals, and Semimetals. • Color coding periodic table • Unit 1 Quiz – Open Note! • Article: Where do elements come from?
Just like you and your family share similarities… So do elements! • 3 main groups • Metals • Non-metals • Semi-metals We will talk about more specific groups later in the week!
1. METALS LOCATION on the Periodic Table: To the left, to the left…
1. METALS • Physical properties • Solids at room temperature (250C) • Luster (shininess) • Good conductors of heat and electricity • High density (Heavy for its size!) • High melting point • Ductile (thin wire) • Malleable (thin sheets)
1. METALS • Chemical properties • Tend to LOSE electrons when bonding • form positive ions – ex. K+, Al3+ • Sometimes corrode (disappear slowly by chemical damage) or rust (reacts with oxygen)
2. NON-METALS LOCATION on the Periodic Table: To the right, and with the exception of Hydrogen!
2. NON-METALS • Physical properties (tend to be the opposite of metals) • Mostly gases at room temperature • No luster (dull) • Non-conductors of heat and electricity • Low density • Low melting point • Brittle (breaks easily)
2. NON-METALS • Chemical properties • Tend to GAIN electrons when bonding
3. SEMI-METALS (Metalloids) LOCATION on the Periodic Table: the Semi-metal “Staircase” What are the semi-metals? B, Si, Ge, As, Sb, Te
3. SEMI-METALS (Metalloids) • Tend to have both metallic and non-metallic physical and chemical properties. • For example, a semi-metal may be shiny like a metal, but cannot conduct electricity.
Please color-code your periodic tables. • The majority of elements are… METALS
B Si As Ge Sb Te
Unit 1 Quiz: Open Notes! • What are isotopes? Give an example. • What are ions? Give an example. • What part of an atom is the most dense? (Where is most of its mass?) • Write a paragraph explaining the relationship between atomic structure and the periodic table. Use these words: atom, proton, neutron, electron, nucleus, atomic number, mass number.