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Presentation transcript:

3.2

And again.. (Start of 3.2) Atomic Number Atomic Mass Number of protons & electrons in an atom Atomic Mass Number of protons and neutrons in the atom

Valence Electrons Remember energy levels? Valence Electrons Electrons of different energy levels are found in different energy levels Valence Electrons Electrons at highest energy level # of valence electrons helps determine chemical properties

Bell Work You need your textbook. Always. Turn in Atomic Model Worksheet if you haven’t already Get out Electron Dot Diagram paper Quiz September 7th over atomic models (3.1) and 3.2 (Reading the periodic table, understanding what the numbers mean, distinguishing between a metal, nonmetal, metalloid, and why hydrogen is special). WRITE THIS IN YOUR AGENDA.

How many valence electrons? Most reactive in the periodic table. Group 1: Alkali Metals How many valence electrons? Most reactive in the periodic table. Why? Lose 1 electron, left with 8, so stable. Chemically stable or not?

Metals in General Pg 94; Represented in blue React by losing their valence electrons Reactivity depends how easily atoms lose valence electrons Reactivity decreases as you go from left to right across periodic table Why?

Alkali Metals Reacting to Water Let’s talk about this first…. Li, Na, K https://www.youtube.com/watch?v=jI__JY 7pqOM

Group 2: Alkaline Earth Metals What do you think makes these different from group 2? Less reactive 2 valence electrons Difficult to melt

Bell Ringer Again… You need your book. Always. Quiz Friday over 3.1 & 3.2. LOOK OVER YOUR NOTES!!!! Get out piece of paper and pencil. Look at the element in group 14, period 7 (pg 688), and tell me…. Name Atomic Number Atomic Mass # of P, N, E # of valence electrons Draw Electron Dot Diagram Make sure your name is on it

Nonmetals Pg 94 Orange section Become stable when they gain or share electrons Can combine with nonmetals and metalloids by sharing electrons

React easily with other elements Halogens Group 17 React easily with other elements Why?

Metalloids Between metals and nonmetals Scattered through Groups 13-17 Can lose or share electrons Some properties of metals, some of nonmetals

Hydrogen Group 1 Metal or nonmetal? Why? Metal or nonmetal? Nonmetal! Properties different from alkali metals Shares electrons Stable at 2