Glue in Periodic Table and Modeling Atoms Complete Bell work.

Transcription

1 Bell Work Glue in Periodic Table and Modeling Atoms Complete Bell work. Divide a page in your composition book into 2 columns. In one column, complete Bohr's models for elements 1, 3, and 11. In the second column, diagram elements 4 and 12. After you are done with the diagrams, look for patterns in the models. Look especially at the electrons since those are the particles that are involved in reactivity. 1

2 Learning Target 3 I can define valence electrons and can explain how they are involved in forming compounds. Pre Post Big Ideas Assess Valence electrons are electrons on the outermost shell of an element. They are involved in chemical reactions. They can be gained, lost, or shared. Assess 2

3 Bohr Models of elements What is the pattern? 3

4 Valence Electrons Copy this on your folded periodic table. Valence electrons are electrons on the outermost electron shell of an atom. Valence electrons are responsible for chemical reactions! The number of valence electrons determines whether an atom of an element will lose, gain, or share electrons in a chemical reaction. 4

5 Determining Valence Electrons Worksheet table shellsvalence.pdf formative assessment 5

6 Periodic Table Study Guide Determining Shells and Valence Electrons 5 th Grade Science Mrs. LaRosa All images are from 6

7 Periods Each row is called a period The elements in each period have the same number of shells 1st Period = 1 Shell 2nd Period = 2 Shells 3rd Period = 3 Shells 4th Period = 4 Shells 7

8 Groups Group 1 = 1 electron Group 2 = 2 electrons Group 8 = 8 electrons 3, 4, 5, 6, 7 Each element in a group has the same number of electrons in their outer orbital, also known as shells. Except for He, it has 2 electrons Each column is called a group The electrons in the outer shell are called valence electrons 8

9 Transition Metals Transition Metals have slightly different rules for shells and valence electrons. This is something you will learn about in High School Chemistry. 9

10 Determine the number of shells and the number of valence electrons for: Carbon 2nd Period = 2 shells C 4th Group = 4 valence electrons 4kids.com 10

11 Determine the number of shells and the number of valence electrons for: Sodium 3rd Period = 3 shells Na 1st Group = 1 valence electron 11

12 N Valence electrons? 12

13 N Valence electrons? 13

14 Ne Valence electrons? Neon 2nd Period = 2 shells 8th Group = 8 valence electrons 14

15 H Valence electrons? 15

16 H Hydrogen Valence electrons? 1st Period = 1 shell 1st Group = 1 valence electron 16

17 Be Valence electrons? Beryllium 2nd Period = 2 shells 2nd Group = 2 valence electrons 17

18 S Valence electrons? 18

19 S Valence electrons? Sulfur 3rd Period = 3 shells 6th Group = 6 valence electrons 19

20 K Valence electrons? 20

21 K Valence electrons? Potassium 4th Period = 4 shells 1st Group = 1 valence electron 21

22 H Valence electrons? 22

23 He Helium 1st Period = 1 shell 8th Group = 2 valence electrons Valence electrons? Helium is the exception in Group 8. Since it has just one shell, that shell can only fit 2 electrons instead of 8. It is in this group because all the elements have a full outer shell. 23