three known as triads The three elements had similar chemical properties in which the atomic weight of the middle element was the average of the other two John Newlands classified the elements into groups of eight known as octaves The eight elements were ordered by increasing atomic weight The first and eighth element had similar properties Dmitri Mendeleev arranged the elements in order of increasing atomic weight The elements showed a periodic repetition of chemical properties How does
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Solid Place of Birth: Many different countries Personality: (melting- 600.61 K --- 327.46 C --- 621.43 F) (Boiling- 2022 K --- 1749 C --- 3180 F) Page 2 Pronunciation Rebus: lēd/ Page 4 # of protons: 82 # of neutrons: 125 # of electrons: 82 Atomic number: 82 Page 6 Family Name: Carbon Family Address: 6 Ancient Drive Brother and Sister: Carbon‚ Silicon‚ Germanium‚ Tin. FleroviumProud Parents of Lead Page 1 Name of element: Kobe Lead Nickname of element: (Pb) Birth Date: Ancient Times
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Name____________________________ Date_____________ Period____ Periodic Table Worksheet Use a Periodic table to find the information asked for below: 1.What is the atomic number of: Calcium____ Iron _____ Gold_____ Uranium_____ 2. What is the Atomic mass of: Calcium___ Iron_____ Uranium_____ Copper_____ 3. How many protons do the following have? 4. How many electrons do the following have? Calcium have____ Gold have____ Gold_______ Iron_____ Copper______ Copper_____ Iron______ Uranium_____
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Atoms and the Periodic Table Chapter 2 Atoms and the Periodic Table / Elements and the Periodic Table * An element is a pure substance that cannot be broken down into simpler substances by a chemical reaction. * Each element is identified by a one- or two-letter symbol. * Elements are arranged in the periodic table. * The position of an element in the periodic table tells us much about its chemical properties. Atoms and the Periodic Table / Elements and the Periodic
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Isotopes and average atomic mass Isotope: element variations with different atomic mass but same atomic number Isotopic Abundance: the relative amount in which each isotope of an element Calculating: given 2 isotopes of an element [B: 10.01u] [B: 11.01u] 1) Given average atomic mass: 10.81u If given percentages‚ you can find average atomic mass by adding each portion 2) Set variables for unknown values Let x represent % abundance for 10/5 B Let 1-x represent % abundance for 11/5 B Calculate:
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What is a chemical reaction? Can it be separated afterwards? 16) What is the law of conservation of mass? The mass of products has to _____ the mass of reactants. Chapter 5: 17) ______ are little‚ basic particles that make up matter. 18) Dalton’s Atomic Theory: I. All elements composed of ______. II. Atoms of the same element are ______. The atoms of one element are different from those of any other element. III. Atoms of different elements can physically mix together or can chemically combine
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increasing atomic weight. The list was wrapped around a cylinder so that several sets of similar elements lined up‚ creating the first geometric representation of the periodic law. oIn 1862 was the first person to make use of atomic weights to reveal periodicity (i.e. when the elements were arranged according to their atomic weights‚ similar elements seemed to occur at regular intervals.) He drew the elements as a continuous spiral around a cylinder divided into 16 parts. The atomic weight of oxygen
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4. postulated the quantum atom nucleus 5. discovered the proton electrons 6. father of atomic theory Dalton 7. location of most of the mass of the atom Bohr 1. unlike charges attract 2. like charges repel 3. charge on a neutron nonmetals 4. location of an electron periodicity shell 5. low ionization energies noble gases 6. repeating nature of atomic structure neutral 7. least reactive family True and Faults (6 points) A gamma ray is a
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colored paper that highlights the following information: • Symbol (lettering must be 11 cm high‚ minimum must be placed in the left hand corner) • Name of element (lettering must be 2 cm high‚ minimum Must be underneath the symbol.) • Atomic number (lettering must be 2 cm high‚ minimum Must be placed in the top right hand corner) • Uses (lettering must be 1 cm high‚ minimum; be creative!) • Fast facts (see grading rubric‚ for details) • Anything else that will add
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element on the Periodic Table. It was discovered in 1945 by Jacob A. Marinsky. It’s a metal‚ and named after the Greek God Prometheus. It is not naturally occurring‚ but can survive outside of a lab. Promethium has an atomic number of 61‚ which is the number of protons. Its atomic mass‚ protons+neutrons‚ is 145u. It is an isotope. This means that it has a different number of neutrons (84) than the number of electrons and protons (61). Every element changes states of matter at different temperatures
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