Oct 22 / 23 Act B15 Families of Elements CH Q LEARNING TARGET: I can use the chemical and physical properties of elements to group (classify) them by common features. CH Q How can elements be grouped based on their physical and chemical properties? VOCAB: next slide

smallest "unit" of matter Atom atomic mass Element family (of elements) Metal Periodic Table of Elements smallest "unit" of matter atom "weight" pure matter related chemically element with special properties all types of matter arranged based on structure and properties

DISCUSSION Identify parts of the Element Card

PROCEDURE AND DATA MATERIALS: PROCEDURE: Read on pg. B-20-21 and summarize DATA: Notes in Journal - sort elements into at least 3 groups - identify which family the groups go in and revise original groups - FINAL CHART : Record Classification System - family names - similar properties - show increasing atomic mass

Alkali Metals Alkaline Metals Noble Gasses Halogens Metals (solid) Reactive (high) 1 bond w/ Hydrogen Oxidize (react with air) Explosive (w/ water) Soft metal Metals (solid) Reactive (low) 2 bond w/ Hydrogen Earth metals Non-metals Reactive (high) 1 bond w/ Hydrogen Metals (solid) Reactive (low-none) 0 bond w/ Hydrogen

Alkali Metals Alkaline Metals Noble Gasses Halogens H - 1 He – 2 Ar – 40 Kr - 84 Li – 9 Na – 23 L - 39 Be – 9 Mg – 24 Ca – 40 F – 19 Cl – 36 Br - 80 What if I did this….. Thoughts???? What if I told you there was a problem? One of these elements is in the wrong spot. Can you figure out which one it is??

1 2 7 8 Alkali Metals Alkaline Metals Noble Gasses Halogens H - 1 Review the qualities (in your notes) of each of the families above. Focusing on the chemical properties, which family makes the most sense for Hydrogen? Each of these groups / families have a number that they are referred by.

List three (3) things you notice about the atomic mass The mass increases as you go across the periodic table from left to right The mass increases as you travel down the periodic table The size of the atom increases as the mass increases (more parts)

Dmitri Mendeleev's first Periodic Table show element videos

ANALYSIS - Discuss and answer Q 3, 4 & 5 on pg. B- 21

Sr Strontium Metal Solid Silver in color Atomic Mass 88 Reactivity: Very High Number of bonds with Hydrogen: 2

ANS CH Q How can elements be grouped based on their physical and chemical properties? A: similar properties (P + C) state/phase of matter (solid, liquid, gas) metal or non-metal increasing mass reactivity HOMEWORK Finish AQs Bring colored pencils