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WARM UP 11/08/13Question: What is atomic number?
Answer: The number of protons in the atom.
Each element has a unique atomic #
Goal: I will explain atomic number & mass number.
ELEMENT OF THE DAY27 – Cobalt – CoCobalt steel is one of the hardest steel alloys and is used in drills and machine bits.
Cobalt compounds are often blue, and are used to tint glass.
60Co is a highly radioactive version of cobalt that is present in nuclear fallout.
AGENDA-Bellwork / Fav Fri-Atomic Number-Mass number & Isotopes-M & M reminder!
-Homework-pg 21-24-Holiday (red & green) pretzel or mint M&Ms for extra credit