Editing Answers To Question On Annenberg Chemistry Challenges And Solution Unit 4 Periodic Table Video

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Answers to [[Question on Annenberg Chemistry Challenges and Solution Unit 4 Periodic Table video]] 
 
 
1. Yes many table to organize elements 
2. Mendeleev 
 
3. Consistent property trends 
 
4. Elements in same column have similar properties 
 
5. As you go across Period, size of atom decreases. Comparing end of Period, decrease Reactivity but not a General trend across Period. 
 
6. Atomic number (number of protons) 
 
7. Chemical symbol (either 1 or 2 letters), Atomic number, Atomic mass. 
 
8. Reactivity is the tendency of an element to undergo a chemical reaction either by itself or with other substances 
 
9. Electron configuration 
 
10. Shells (name you will need to know is Energy level) 
 
11. Electrons in highest energy level (farthest from nucleus) called Valence electrons. 
 
12. Since there is only one valence electron and it is farther from the nucleus, the nucleus has less pull (we call it Coloumbic Force), so it takes less energy for electron to be removed from the atom. 
 
13. Number of and shape of area of energy level where the valence electron are located are same. This causes their properties including Reactivities to be same/similar. 
 
14. Eight (8) 
 
15. Valence shell (we call Energy level) 
 
16. Number of valence electrons (in valence shell). 
 
17. s block - far left block, 
p block - far right block 
d block - one in middle 
f block - one at bottom (detacted from table and only 2 rows) 
18. Glenn Seaborg

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