Reading the Periodic Table

Dmitri Mendeleev (1869) In 1869 Mendeleev and Lothar Meyer (Germany) published nearly identical classification schemes for elements known to date. The periodic table is based on the similarity of properties and reactivities exhibited by certain elements. Later, Henri Moseley ( England,1887-1915) established that each element 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

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

Atomic Symbol Atomic Name

The atomic number tells you the number of PROTONS. (It is also 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? How could you find the number of neutrons??? Answer: Atomic mass (rounded) Atomic # # of neutrons

10 p+ 10 e- 10 n0 Lets give Particle Inventory a Try! How many protons, electrons, and neutrons does Ne have? 10 p+ 10 e- 10 n0

Let’s Practice Particle Inventory… Find the number of p+, e-, and n for each element: 1. H 2. K 3. Tb 1 p+ 1 e- 0 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=4 e=4 n=5 p=5 e=5 n=6 p=6 e=6 n=6 p=7 e=7 n=7 p=8 e=8 n=8 p=9 e=9 n=10 1. Be 2. B 3. C 4. N 5. O 6. F

Particle Inventory Find the number of p+, e-, and n for each element: 1. Cs 2. Hg 3. Cu 4. Ta 5. Br 6. Es 7. Md 8. W 9. Pb 10. Rn

Particle Inventory Practice Find the number of p+, e-, and n for each element: Na Mg Al Si P p= 11 e= 11 n= 12 p= 12 e= 12 n= 12 p= 13 e= 13 n= 14 p= 14 e= 14 n= 14 p= 15 e= 15 n= 16 p= 16 e= 16 n= 16 p= 17 e= 17 n= 18 p= 18 e= 18 n= 22 p= 19 e= 19 n= 20 p= 20 e= 20 n= 20 16. S 17. Cl 18. Ar K Ca

Particle Inventory Find the number of p+, e-, and n for each element: Cs Hg Cu Ta 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 6. Es 7. Md 8. W 9. Pb 10. 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 21. Yb La V Os 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

Particle Inventory Practice Particle Inventory Am Fr Cd Bi Kr 26. Am 27. Fr Cd Bi 30. 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 Do you see any patterns here in your answers?