Topic: Element Identity and Reactivity

1. Topic: Element Identity and Reactivity Essential Question: What do the protons and valence electrons determine about an element?

2. Topic: Element Identity and ReactivityEssential Question: What do the protons and valence electrons determine about an element? Protons The number of protons is used to identify an element The atomic number on the periodic table is the number of protons For example: an atom of Carbon has 6 protons

3. Topic: Element Identity and ReactivityEssential Question: What do the protons and valence electrons determine about an element? Electrons The number of electrons = the number of protons For example: Carbon has 6 protons and 6 electrons

4. Topic: Element Identity and ReactivityEssential Question: What do the protons and valence electrons determine about an element? Electron Shells Each shell can hold A certain number of electrons 1st- 2 electrons 2nd- 8 electrons 3rd- 8 electrons - - - - - Nucleus - - - - - - - - - - - - -

5. Topic: Element Identity and ReactivityEssential Question: What do the protons and valence electrons determine about an element? Valence Electrons Electrons located on the outermost shell of an atom They determine the reactivity of an element

6. Topic: Element Identity and ReactivityEssential Question: What do the protons and valence electrons determine about an element? Valence electrons Elements with 8 valence electrons are stable (won’t react) Elements with less than 8 valence electrons are reactive For example, Sodium, which has 1 valence electron, reacts with Chlorine, which has 7 and creates NaCl, which is table salt Cl Na

7. Now take some time… • Take 2 minutes to go over your notes and highlight or underline the main ideas that answer the essential question, you should not highlight everything: • What do the protons and valence electrons determine about an element? • Share with a neighbor, did you highlight the same thing?

8. Time to use the left hand column • You will now write your own questions using the questioning verbs provided.

9. Topic: Element Identity and ReactivityEssential Question: What do the protons and valence electrons determine about an element? Protons The number of protons is used to identify an element The atomic number on the periodic table is the number of protons For example: an atom of Carbon has 6 protons Write a question using one of the following verbs: Explain Define

10. Topic: Element Identity and ReactivityEssential Question: What do the protons and valence electrons determine about an element? Electrons The number of electrons = the number of protons For example: Carbon has 6 protons and 6 electrons Write a question using one of the following verbs: Explain Define

11. Topic: Element Identity and ReactivityEssential Question: What do the protons and valence electrons determine about an element? Electron Shells Each shell can hold A certain number of electrons 1st- 2 electrons 2nd- 8 electrons 3rd- 8 electrons Write a question using one of the following verbs: Explain Define - - - - Nucleus - - - - - - - - - - - - - -

12. Topic: Element Identity and ReactivityEssential Question: What do the protons and valence electrons determine about an element? Valence Electrons Electrons located on the outermost shell of an atom They determine the reactivity of an element Write a question using one of the following verbs: Explain Define

13. Topic: Element Identity and ReactivityEssential Question: What do the protons and valence electrons determine about an element? Valence electrons Elements with 8 valence electrons are stable (won’t react) Elements with less than 8 valence electrons are reactive For example, Sodium, which has 1 valence electron, reacts with Chlorine, which has 7 and creates NaCl, which is table salt Write a question using one of the following verbs: Explain Define Cl Na

14. Now let’s write a summary Look at each question you wrote on your own, and answer each question in a complete sentence.