Biology Exam Review Unit One – Biochemistry What is an isotope? Isotope - An isotope is all atoms of the same element that have the same number of protons‚ but they may have different numbers of neutrons in the nucleus. - This means that all atoms with the same atomic number can have different atomic masses. - Because they have the same number of protons and electrons‚ they behave exactly the same in chemical reactions. Radioisotope - The nuclei of some isotopes of an element are unstable
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Part I: Atomic Structure – Fill in the missing information on atomic structure and organic compounds. Atomic Structure Subatomic Particle Charge Location in an Atom Proton Positive Nucleus Neutron Neutral Nucleus Electron Negative Spherical (outer-shell) Organic Compounds Large Biological Molecule Atoms it Contains Monomer(s) Function(s) in Living Organisms Carbohydrates C‚ H‚ and O Monosaccharides Source of energy Lipid C‚ H‚ and O Glycerol and fatty acids Cushion
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small fraction of the total volume of the atom that held most of the mass of the atom” (Chem Teacher). His nuclear model then replaced the Plum Pudding model. Even though all of Rutherford’s discoveries are exceedingly important‚ I believe that the most important one is‚ his discovery of the an atom’s nuclear structure The atom now consist of a positive nucleus with negative electrons in circular orbits around it. In addition to this‚ he discovered that atoms have a dense core (nucleus) where protons
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sizes of ions and atoms d. Students know how to use the periodic table to determine the number of electrons available for bonding. I explain to my students that columns 4A-7A are ’wanna be’ noble gases‚ ie want 8 valence e- (except for first period since only need 2 e-). The elements are listed in columns and each of the A columns gives the number of valence electrons. Transition metals of course don’t follow the same rules‚ so just talk about columns 1A-8A. The atoms in columns 1A-4A can
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called atoms which cannot be created‚ destroyed or split b) all atoms of one element are identical:- same mass and same chemical properties c) a chemical reaction consists of rearranging atoms from one combination to another. d) When elements combine to form compounds‚ small whole numbers of atoms form molecules. However this was proved to be not entirely correct. Atoms have been split as well as created i.e. nuclear reactions. Also there are isotopes‚ meaning that not all atoms of an element
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discovered by Experimenting with discharging tubes. Eventually they found out the rest of the Atoms over time. Which brings me into the word of Orbital. Orbital is a Neutron‚ electron or a proton Going around a single atom with certain amounts of energy levels. Which are all made up in the Cloud. The cloud is a intense color representing how many atoms are not representing a electron. When you have a Atom and you don’t know what its called or how it was made you can look at the periodic table. The
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the halogen (or halide) affect reactivity. EXPERIMENTAL Part A: Atomic Number In the modern periodic table‚ the elements are actually arranged in order of increasing atomic number--that’s the number of protons in one atom of a particular element. An undisturbed atom is electrically
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10 A 25 B 11 B 26 A 12 C 27 C 13 A 28 E 14 D 29 C 15 D 30 SOME KIND OF BALANCE EQ. QUESTION 1) Identify the description of an atom. A) neutrons and electrons in nucleus; protons
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Objectives 1-Describe the periodic trend in atomic radius and relate it to atomic structure 2- Describe the periodic trend in electronegativity and relate it to atomic structure Did you know? There are atoms with no electronegativity because electro negativity refers to the attraction of atoms of electrons in a compound; elements that do not form are assigned no electronegativity values. Atomic Radius ≠ Ionization Energy As you move from left to right on the periodic table‚ the number of valance
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Chemistry Review (mid-term) 1. Use the equation for atomic mass to answer the following questions. (http://johnheilchem10.escuelacampoalegre.wikispaces.net/file/view/average+atomic+mass+calculations+-+3.pdf) 1. Argon has three naturally occurring isotopes: argon-36‚ argon-38‚ and argon-40. Based on argon’sreported atomic mass‚ which isotope do you think is the most abundant in nature? Explain. 2. Copper is made of two isotopes. Copper-63 is 69.17% abundant and it has a mass of 62.9296 amu.
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