Chem
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| Dmitri Mendeleev | Who's attributed with the idea of arranging the known elements of his time in a table according to their chemical and physical properties.
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| This scientist predicted that the empty spaces on his periodic table represented... | undiscovered elements
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| Henry Moseley | Who arranged the periodic table of elements in the order of atomic number?
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| The periodic law states there is a periodic repetition of physical and chemical properties of the elements ... | when they are arranged in order of increasing atomic number
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| The vertical columns of the periodic table are called | groups
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| Each period in the periodic table corresponds to | an energy level
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| What are valence electrons? | electrons found in the outermost energy level of atoms
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| The horizontal rows of the periodic table are called? | periods
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| What do elements in the same periodic group have in common? | Same valence configuration, same valence electrons, and similar chemical properties.
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| What do elements in the same periodic periods have in common? | Same number of occupied energy levels- principle energy levels (PEL).
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| How many elements are in a period in which only the s and p sub-levels are filled? | 8
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| Identify the sub-levels in a period that contains 32 elements | s,p,d,f
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| The number of valence electrons in group 17 element is | 7
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| For groups 13 through 18 the number of valence electrons is equal to | The group # minus 10
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| For group two elements, which sub-level are the valence electrons located in? | S
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| Name the three classes of elements | metals, nonmetals, and metalloids
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| Lose electrons | metals
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| Gain electrons | nonmetals
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| dul, brittle | nonmetals
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| Good electrical conductors | metals
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| malleable, ductile | metals
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| Are not conductive | nonmetals
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| The most reactive group of nonmetals | group 17, halogens
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| This group is unreactive, and only found in pure form in nature | group 18, noble gases
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| The group's name means "basic" | group 2, alkaline earth metals
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| Group of metals contains groups 3-12 | groups 3-12, transition metals
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| Group contains the most reactive group of metals | groups 1, alkali metals
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| elements are found in the second row of the f-block elements | actinides
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| The class of elements have both metallic and nonmetallic properties | metalloids
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| Explain why atomic radius decreases going across the period left to right on the periodic table. | The # of energy levels remains the same. The number of protons increases in the nucleus of each successive element atom. This increases the positive nuclear charge - pulling electrons closer to the nucleus.
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| Choose the best reason that the atomic radius generally increases moving down a group of elements. | the number of occupied energy levels increases
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| Which of the following atoms is largest: nitrogen, phosphorous, or arsenic? | arsenic
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| Find phosphorus, sulfur, and chlorine on the periodic table. Which of these is the largest atom? | phosphorus
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| Which of the following atoms is smallest; nitrogen, oxygen, or fluorine? | Fluorine
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| Write a definition for ionization energy | energy required to remove an electron from an atom.
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| Which atom would it take more energy to remove its first electron, sodium or aluminum? | aluminum
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| As you move left to right across a period. the first ionization energies | increases
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| As you move from the top of a group to the bottom, the first ionization energies | decreases
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| Which of these elements have the highest ionization energy? aluminum, silicon, or phosphorus? | phosphorous
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| Why is the third ionization energy of magnesium so much greater than the second ionization energy? | Once the 1st two electrons are removed, mg will be left with a full octet for its outer energy level.
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| Which of these elements have the highest ionization energy? tin, arsenic, or sulfur | sulfur
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| List the following atoms in order of decreasing electronegativity , Cl, K, & Zn | Cl, Zn, K
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| What is the general trend of electronegativity as you go down the group on the periodic table? | Electronegativity decreases moving down a group on the periodic table.
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| What element is the most electronegative? | fluorine
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| do metals tend to have high or low electronegativites? | low
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| Which of the following is the smallest; a lithium atom, Li+ ion, or sodium atom? | Li + ion
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| what is the trend for reactivity for the alkali metal group? | Reactivity increases going down the group
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| The halogens group? | reactivity decreases going down the group
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Created by:
sadiesamson