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Atomic number

Periodic Table - Notes

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Notes ? Periodic Table Do you know all your elements? http://www.privatehand.com/flash/elements.html Squares on the Periodic Table Each square contains Element Symbol Element Name Atomic Number = Protons Average Atomic Mass = Molar Mass Some contain the physical state at Room Temperature What is the atomic mass? The mass of one atom is VERY small therefore we use a relative scale called the AMU. One AMU is exactly 1/12 the mass of a carbon-12 atom. Protons + Neutrons = AMU = Atomic Mass Unit What is the average atomic mass? In a sample of many atoms, various isotopes exist. The abundance of each isotope impacts the average mass of the sample. To find the average atomic mass, multiply the mass times the abundance of each isotope and add these together.

Science history

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History of Science ? ? Illusion ? Delusion - Truth I thought this was Science Course Science is the Truth ?. but but ?.. Science seems to change all the time Hmmmm First Quiz From Fire to Atomism Early Greek Atomic Theory Some thought EVERYTHING was made from water in one of the forms (ice, liquid, gas) Democritus ? atoms differed in only shape and size The concept of the ?nocut? atomos was developed ? SMALLEST BUILDING BLOCK Arostotle ? all matter is composed of four elements ? Earth, air, fire, water The philosopher's stone and the rise of alchemy ?convert cheaper metals into gold finding the?elixir of life ?in the air an "ether" which breathed life into living things Problems with Alchemy

Bob Jones PPT Notes -- Chapter 5a

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Periodic The Table 1 Lavoisier Made the first list of 30 substances he thought were elements D?bereiner Created a list of elements based on triads triads: groups of 3 elements with similar properties Created a list of elements based on triads problem with triads: Soon more elements were found; there were more than 3 similar elements to a group. D?bereiner periodicity repetition of a property on a regular basis Newlands Arranged elements by atomic mass Observed the ?law of octaves? Every 8th element repeats properties. Included the transition metals Mendeleev Developed the periodic table by arranging elements by atomic mass (like Newlands) Included the transition metals (like Newlands) Mendeleev Left blanks when properties or mass did not fit

Chemistry

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Chemistry Study Guide Unit 1: Measurement and the Methods of Chemistry Counting significant figures: 1) leading zeros never count 2) Trailing zeros only count if there is a decimal point written 3) All numbers that aren?t leading or trailing zeros count Unit 2: Atomic Structure, Periodicity, and Nuclear Energy Proton: +1 (charge) Neutron: 0 (charge) Electron: -1 (charge) Atomic number= number of protons within an atom Atomic mass= total weight of the atom. P+N If there is a power to the left of the element, that implies the mass. Isotope: same atom with same atomic number, but different number of neutrons. Different weight. Neutrons and protons are INSIDE nucleus. Electrons on orbitals. Valence electrons= electrons on outermost shell. The electrons that do all reactions.

Campbell Biology 9th edition

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Campbell Biology Review Chapter 2 1. All organisms are composed of ____________, which is defined as anything that occupies space and has mass. 2. What is the definition of an element? 3. How does a compound differ from an element? 4. What four chemical elements compose about 96% of living matter? 5. What name is given to elements found in small amounts that are necessary to living matter? 6. Which of these elements (type given above) is necessary to man and other vertebrates but not to other living organisms? a. Oxygen b. Iodine c. Phosphorus d. Calcium e. None of the Above 7. What element, known as a toxin to man, has inadvertently been found in Asian drilled wells, exposing many to its dangerous effects?

Campbell Biology 9th edition

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Campbell Biology Review Chapter 2 1. All organisms are composed of ____________, which is defined as anything that occupies space and has mass. 2. What is the definition of an element? 3. How does a compound differ from an element? 4. What four chemical elements compose about 96% of living matter? 5. What name is given to elements found in small amounts that are necessary to living matter? 6. Which of these elements (type given above) is necessary to man and other vertebrates but not to other living organisms? a. Oxygen b. Iodine c. Phosphorus d. Calcium e. None of the Above 7. What element, known as a toxin to man, has inadvertently been found in Asian drilled wells, exposing many to its dangerous effects?

Campbell Biology Chapter 2 outline

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#AP Bio #CampbellBiology #Chapter 2 #Outline

SUBATOMIC PARTICLES Proton ? 1 positive charge (P+) Neutron ? no charge (N0) Electron ? 1 negative charge (E+) Nucleus An atom's dense central core, containing protons and neutrons. Electrons move around the nucleus Matter Anything that has mass and takes up space Elements Substance that cannot be broken down by a chemical reaction 92 occur naturally 25 of which are essential for life Bulk elements Required by the body in large amounts C N H O (make up 96% of the body) Trace elements Required by the body in small amounts Ultra trace elements Required by the body in minute amounts Atoms Smallest unit of matter that still retains properties of an element Weight Add proton and neutrons together for weight of nucleus Every proton and neutron weights one Dalton

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Gone With the Wind

Michael Treacy 3/3/2010 Pd. 3 Ozone Hole @ TD 1. What is the Ozone and why do we need it in our atmosphere to have a healthier planet? The Ozone is the Gas O3. This gas is located in the Stratosphere and absorbs UV Rays. We need the ozone in our atmosphere because it absorbs 98% of the UV Rays. Without the ozone to filter all these UV Rays many animals would have medical / health problems. 2. Describe how the ozone protects us. The ozone protects us by filtering out and absorbing most of the UV Rays before they reach the earth. Most of the Rays are biologically harmful and know to damage tissues and cells. 3. How is a chlorine atom harmful to the ozone in the stratosphere?
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