Reading the Periodic Table Atom Quiz 1

Dmitri Mendeleev (1869) In 1869 Mendeleev and Lothar Meyer (Germany) published nearly identical classification schemes for elements known to date. The periodic table is base on the similarity of properties and reactivities exhibited by certain elements. Later, Henri Moseley ( England,1887-1915) established that each elements has a unique atomic number, which is how the current periodic table is organized.

What are some similarities and differences from today’s periodic table vs. Mendeleev’s table?

Creating A Table Use the whiteboards for the answers.

Creating a Table :The purpose of this lesson is to acquaint you with the organization of the elements by allowing you to create your own table from the patterns you see in the elements.

Instructions 1. Work in groups of three/four with one set of periodic table cards. 2. Find Be, Mg, Ca, and Sr from the deck of cards, and arrange them in a column like the one on the right. Look for similar characteristics in that group. These cards don’t move. Build off of them. 3. With your team, decide how you can use the remainder of the cards to organize the elements into a similar pattern on the right. 4. Arrange the cards and answer the following questions on a white board.

Follow Up Questions kevin.madigan@nccvt.k12.de.us 1. What characteristics did you use for sorting the cards. 2. Did you notice any cards that didn’t quite fit, or seemed out of order? Explain your thinking. 3. Where did you put H and He? What was your reasoning for their placements? Have students take a picture with phones to discuss

Follow Up Questions What characteristics did you use for sorting the cards. Color Size Number of “sticks” Atomic mass How reactive it is State of matter Metal or non-metal or metalloid

2. Did you notice any cards that didn’t quite fit, or seemed out of order? Explain your thinking.

3. Where did you put H and He 3. Where did you put H and He? What was your reasoning for their placements?

Following Up Questions 4. Why do some elements have a red, black or green ring around it? Red =gases green = liquid black =solid

Following Up Questions 5. What patterns or characteristics do you see emerging in “your” periodic table? Size increasing as you go down. Sticks increase as you move to across Mass increasing as you go down.

Correct Periodic Table

*Diggin’ Deeper Question* What properties would the missing “element” in row 4 have? If you had to make a card for it, what would it look like? Green color on the card Four “sticks” Reacts very slowly with oxygen Silver solid Found in GeH4 Germanium

Remember when… In seventh grade they said all matter is made up of small “particles”. We call them ATOMS! And that these “particles”, now called ATOMS, were made up of even smaller “particles!” These smaller particles are called… “Subatomic Particles” and there are three of them. Protons Electrons Neutrons Quarks and gluons

Atomic Symbol Atomic Name

Or the number of electrons. Atomic Number The atomic number tells you the number of PROTONS. Or the number of electrons.

What does Atomic Mass tell us? The number of Protons and Neutrons Atomic Mass

Protons Neutrons Atomic Mass (Rounded)

Do you see any problems here with the particles? How could you find the number of neutrons??? Answer: Atomic mass (rounded) Atomic # # of neutrons

Particle Inventory a try! Lets give Particle Inventory a try! How many protons, electrons, and neutrons does Mg have? 12 p+ 12 e- 12 n0

Lets give it Particle Inventory a Try! How many protons, electrons, and neutrons does Na have? 11 p+ 11 e- 12 n0

Let’s Practice Particle Inventory… Find the number of p+, e-, and n for each element: Gold Potassium Terbium 1. Au 2. K 3. Tb 79 p+ 79 e- 118 n 65 p+ 65 e- 94 n 19 p+ 19 e- 20 n

Particle Inventory Find the number of p+, e-, and n for each element: P=21 e=21 n=24 p=5 e=5 n=6 p=6 e=6 n=6 4. Sc 5. B 6. C p=7 e=7 n=7 p=8 e=8 n=8 p=9 e=9 n=10 7. N 8. O 9. F

Particle Inventory Find the number of p+, e-, and n for each element: 10. Cs 11. Hg 12. Cu 13. Ta 14. Br 15. Es 16. Md 17. W 18. Pb 19. Rn

Particle Inventory Find the number of p+, e-, and n for each element: 10. Cs 11. Hg 12. Cu 13. Ta 14. Br p= 55 e= 55 n= 78 p= 80 e= 80 n= 121 p= 29 e= 29 n= 35 p= 73 e= 73 n= 108 p= 35 e= 35 n= 45 15. Es 16. Md W 18. Pb 19. Rn p= 99 e= 99 n= 153 p= 101 e= 101 n= 157 p= 74 e= 74 n= 110 p= 82 e= 82 n= 125 p= 86 e= 86 n= 136

Particle Inventory Practice Particle Inventory Yb La V Os Eu Yb La V Os 34. Eu p= 70 e= 70 n= 103 p= 57 e= 57 n= 82 p= 23 e= 23 n= 28 p= 76 e= 76 n= 114 p= 63 e= 63 n= 89 What is a reoccurring pattern when looking at the particle inventory data above? Protons and Electrons numbers are always the same.

Particle Inventory Practice Find the number of p+, e-, and n for each element: 20. Sr 21. Po 22. Al 23. Si 24. P p= 38 e= 38 n= 50 p= 84 e= 84 n= 125 p= 13 e= 13 n= 14 p= 14 e= 14 n= 14 p= 15 e= 15 n= 16 25. S 26. Cl 27. Ar 28. At 29. Ca p= 16 e= 16 n= 16 p= 17 e= 17 n= 18 p= 18 e= 18 n= 22 p= 85 e= 85 n= 125 p= 20 e= 20 n= 20

Particle Inventory Practice Particle Inventory Am Fr Cd Bi Kr Am Fr 37. Cd 38. Bi 39. Kr p= 95 e= 95 n= 148 p= 87 e= 87 n= 136 p= 48 e= 48 n= 64 p= 83 e= 83 n= 126 p= 36 e= 36 n= 48