Warm up 2/18/13 Draw a picture of what an atom looks like.

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Presentation transcript:

Warm up 2/18/13 Draw a picture of what an atom looks like. Label as many parts as you can. Give example of types of atom?

Atom

Atom

Unit EQ:How is periodic table arranged? Subatomic particles? Warm-up 10/1/13 How many protons, neutrons and electrons does Thorium-232 and Thorium-236 have?

Unit EQ: How is Periodic Table arranged? Warm-up What does the word periodic/period mean to you? Open book to p158 Get 3 colored pencils out of drawer repeating in a predictable pattern

Unit EQ: How is Periodic Table arranged? Three main classes of elements Then within those 3 18 groups (columns) 7 periods (rows) Metal metalloids non-metals

Calculating subatomic particles Atomic number (Z)= # protons = # electrons Atomic Mass (A)– weighted average -atomic mass equal to # of protons plus # of neutrons in nucleus Mass number = protons + neutrons for specific isotope Isotope – atom of same element with different # of neutrons and therefore different mass numbers.

Unit EQ: How is Periodic Table arranged? Mendeleev – 1869 (russian) arranged elements according to atomic mass. 1st periodic table He left blanks in table –predicted presence of unknown elements – Awesome! Lothar Meyer – a little late Moseley – 1913 (british) made slight change and arranged by atomic number. Modern periodic table

Ticket out the Door 10/8 1)How many protons does Yttrium-90 have? 2) How many electrons in Y-90? 3) How many neutrons in Y-90? 4) Who is given credit for discovering the nucleus? 5) Which of the following is a metalloid? sodium , silicon, nitrogen 6) Which of the following is a non-metal? boron , sulfur, nickel 7) What group is germanium in? 8) What period is germanium in?

RedoTicket out the Door Convert the following to scientific notation 1) 237,000 2) 50000 3) 0.00000045 Convert units – write units with #’s 4) 14 millimeters to meters 5) 50,000,000 milliliters to kiloliters 6) What is the density of a 75g sample that occupies 3.5cm3 space?

Define mixture – solution- homogeneous – heterogeneous – compound element substance uniform/same throughout different throughout