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UM CHEM 1110 - Atoms & the Periodic Table Worksheet KEY

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Chemistry 1110 Atoms & the Periodic Table I. Write the correct atomic symbol for the following elements: Sodium Barium Phosphorous Oxygen Bromine Na Ba P O Br Boron Arsenic Krypton Molybdenum Beryllium B As Kr Mo Be II. Write the correct molecular formula for the compounds which contain the following number and types of atoms: One sodium atom and one chlorine atom Two carbon atoms and two hydrogen atoms NaCl C2H2 Three hydrogen atoms, one phosphorous atom, and four oxygen atoms H3PO4 III. Give the number of each of the different types of atoms represented in the following molecular formulas: Li3PO4 (NH4)2S 3 lithium atoms, 1 phosphorous 2 nitrogen atoms, 8 hydrogen atoms, 1 sulfur atom atom, 4 oxygen atoms CaF2 Ba(CH3CO2)2 1 calcium atom, 2 fluorine atoms 1 barium atom, 4 carbon atoms, 6 hydrogen atoms, 4 oxygen atoms IV. How many protons, neutrons, and electrons are contained in each of the following atoms/ions? 244Pu 241Am 77As3- 94 protons 95 protons 33 protons 150 neutrons 146 neutrons 44 neutrons 94 electrons 95 electrons 36 electrons 133Cs+ 193Ir 56Mn2+ 55 protons 77 protons 25 protons 78 neutrons 116 neutrons 31 neutrons 54 electrons 77 electrons 23 electrons V. Determine the atomic weight of the average isotope of each element given the following information: Naturally occurring silver is a mixture of 51.84 % 107Ag and 48.16% 109Ag. (107)*(0.5184)+(109)*(0.4816) = 107.96 amu Naturally occurring boron is a mixture of 80.10 % 11B 19.90 % 10B. (11)*(0.8010)+(10)*(0.1990) = 10.80 amuV. (a) Tell whether the following elements are metals, nonmetals, or metalloids. Additionally, give the group or family name if applicable (e.g. alkali metals, inner transition metals) Ag Cl Ca Cs C Cu Cm metal nonmetal metal metal nonmetal metal metal (transition (halogen) (alkaline (alkali (transition (inner transition Metal) earth metal) metal) metal) metal) Sr Sb N I Gd Ge Fr metal metalloid nonmetal nonmetal metal metalloid metal (alkaline (halogen) (inner transition (alkali earth metal) metal) metal) (b) From the above list of elements, group together those which would be expected to behave in a similar fashion (i.e. have similar reactivity) Ag & Cu Cl & I Ca & Sr Cs & Fr C & Ge Cm & Gd Sb & N VI. (a) Give the element names and the number of valence electrons in atoms of the following elements. Ne Na N S Si Se Sr neon - 8 sodium - 1 nitrogen - 5 sulfur - 6 silicon - 4 selenium – 6 strontium - 2 Rn Rb Br Be Ba Al Ar Radon - 8 rubidium - 1 bromine - 7 beryllium - 2 barium - 2 aluminum - 3 argon - 8 (b) From the above list of elements, group together those which would behave in a similar fashion (i.e. have similar reactivity) *Not all elements listed above have matching groups. Ne, Rn, & Ar Na & Rb S & Se Sr, Be, & Ba VII. Tell how many total electrons each of the following atoms or ions has. Then match the following atoms or ions on the left to the atoms or ions on the right which have the same number of electrons (and must therefore share the same electronic configuration). 10 electrons Mg2+ Br- 36 electrons 20 electrons Ca Ti2+ 20 electrons 18 electrons K+ F- 10 electrons 36 electrons Kr Ar 18


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