Ch 12-14 Hw

Spencer Lee B 3/26/07 pg 307 1 Democritus’ discovery in atoms that they are uncut table. 2. He learned that elements combine with atoms into specific proportions make up elements. Spencer Lee B 3/27/07 pg 310 1. Nucleus 2. Thomson finds that electrons have a negative charge while Rutherford says that the nucleus is larger and the electrons pass through because they’re smaller. 3. Bohr’s theory states of electron paths but new study shows electron clouds. Spencer Lee b 3/28/07 pg 313 1. Protons and Neutrons 2. There charges of each particle cancel out. 3. It contains the most dense particles of an atom the protons and neutrons. Spencer Lee B 3/29/07 pg 317 1. Neutrons-no charge, 1 amu, in nucleus. Protons- positive charge, 1 amu, in nucleus Electrons- negative charge less than one, electron clouds 2. proton- 13 neutrons- 14 electrons-13 Spencer Lee B 3/30/07 pg 333 1 A period is a row but a group is a column. 2. By their properties and classification, metal, metalloids, and nonmetals. 3. Metals- Good conductors metalloids- Some are some are not Nonmetals- poor conductors.

Spencer Lee B 3/31/07 pg 337 1. Very reactive metals, soft, brittle, low density. 2. They share same properties. 3. it is because they are reactive they combine. Spencer Lee B 4/1/07 pg 341 1. Group 18 2. React violently to form salt, many combined in nature. 3. 114/ odorless, colorless. 4. Hydrogen colorless, odorless, reacts with oxygen Sodium soft, silvery, reacts with chlorine Spencer Lee B 4/4/07 pg 344 1. group 2. period 3. Alkali metals 4. Noble gases 5.b 6. B 7. C 8. B 9. C 10. C 11. Help predict element in table. 12. Arranged elements in atomic order 13. Calendar/ Numerical order 14. Nonmetal 1, 14-18 Metalloid 13-16 metals 1-16 Spencer Lee B 4/18/07 pg 355 1-5 1. Bond that joins atoms together. 2. Electrons on the outer most level 3 4 electrons. 4. They will bond together with another element. 5. Yes, it does not have a full 8 electrons.