Atomic Mass Agenda Element Quiz Submit homework Read 4.7 & 4.8 Notes Homework.

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Atomic Mass Agenda Element Quiz Submit homework Read 4.7 & 4.8 Notes Homework

Elements

Dev of Atomic Theory

How do isotopes differ?

How do ions differ?

14 6 C ____ p + ____ e - ____ n o

9 4 Be +2 ____ p + ____ e - ____ n o

36 17 Cl - ____ p + ____ e - ____ n o

Homework

Element Quiz Flip around the PT so no one can see the symbols When done with the quiz flip it over and draw you favorite Pumpkin!

READ Grab book Read section 4.7 & 4.8

Average Atomic Mass Date:

Determining Average Mass Multiply Mass number by Percent abundance. Add the answers.

Example Cesium is 75% 133 Cs, 20% 132 Cs, 5% 134 Cs. What is the average atomic mass?

Atomic Mass Unit An amu is the mass of a single proton. 1 amu = 1.67* g

Example Chromium has four istopes. 4.35% 50 Cr, 83.79% 52 Cr, 9.5% 53 Cr, 2.36% 54 Cr. What is the average atomic mass of Cr?

Homework Complete isotopes and average atomic mass