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# Atomic Bonds

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ISWI Earth science class- slides on atomic bonds.

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### Atomic Bonds

1. 1. Earth Science<br />Mrs. Harris<br />Sept.29th 2010<br />
2. 2. So… a proton, an electron, and a neutron are out having dinner…<br />
3. 3. Today:<br />Bonds!<br />Ionic<br />Covalent<br />Game show!<br />
4. 4. Mini Review<br />What we know:<br />Atoms are simplest form of matter<br />Atoms of an element are the same<br />Atoms are made of protons, neutrons, & electrons in equal proportions under regular circumstances<br />Protons are positive, electrons are negative<br />What we’re going learn<br />How atoms can combine<br />How compounds are held together<br />What happens when sub-atomic particles change in an atom<br />
5. 5. Drawing Atoms<br />The protons and neutrons are in the nucleus.<br />The atomic number tells us how many protons there are (so that means it’s the same number of neutrons and electrons under normal conditions).<br />Use the periodic table to find out how many protons an oxygen atoms has.<br />
6. 6. Drawing Atoms<br />The protons and neutrons are in the nucleus.<br />The atomic number tells us how many protons there are (so that means it’s the same number of neutrons and electrons under normal conditions).<br />Use the periodic table to find out how many protons an oxygen atoms has.<br />Electrons are drawn on electron shells. The rule to drawing them is that the first one holds 2 electrons, the next shell holds up to 8, and the shell after that can hold up to 8.<br />
7. 7. Here’s the deal<br />Atoms that have only a few spaces left really like to fill those empty seats… like a concert!<br />Atoms that only have a few electrons in their outer shell have a hard time hanging on to them… like a bad concert where people leave!<br />
8. 8. So when atoms get together:<br />Sometimes they steal electrons<br />This is an ionic bond<br />An ion is an atom with a charge (+ or -)<br />Comes apart easy in water usually<br />Sometimes they share electrons<br />This is a covalent bond.<br />This is the strongest bond.<br />
9. 9. Ionic Bond: Let’s try drawing salt!<br />NaCl (sodium chloride) <br />I need to know what Na (sodium) looks like.<br />I need to know what Cl (chlorine) looks like.<br />
10. 10. Do you know what will happen?<br />
11. 11. One molecule of sodium chloride.<br />
12. 12.
13. 13. Covalent Bond: Let’s draw water!<br />H2O (dihydrogen oxide)<br />I need to know what oxygen looks like.<br />I need to know what hydrogen looks like.<br />
14. 14.
15. 15. Sharing is Caring<br />Equal sharing: nonpolar<br />Unequal sharing: polar<br />
16. 16. Any questions on bonds?<br />
17. 17. Polar, covalent, electron, ionic, nonpolar, neutron, proton, atomic<br />
18. 18. Why we rely on protons<br />Sometimes an atom can have a different number of neutrons<br />These are called isotopes<br />Very common one is C14<br />12<br />14<br />C<br />C<br />6<br />6<br />
19. 19. Game Time!<br />
20. 20. Next week:<br />Minerals <br />Live lab!  <br />