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UM CHEM 1110 - Atoms & the Periodic Table Worksheet

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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 Boron Arsenic Krypton Molybdenum Beryllium 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 Three hydrogen atoms, one phosphorous atom, and four oxygen atoms III. Give the number of each of the different types of atoms represented in the following molecular formulas: Li3PO4 (NH4)2S CaF2 Ba(CH3CO2)2 IV. How many protons, neutrons, and electrons are contained in each of the following atoms/ions? 244Pu 241Am 77As3- 133Cs+ 193Ir 56Mn2+ 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. Naturally occurring boron is a mixture of 80.10 % 11B 19.90 % 10B.V. (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 Sr Sb N I Gd Ge Fr (b) From the above list of elements, group together those which would behave in a similar fashion (i.e. have similar reactivity) 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 Rn Rb Br Be Ba Al Ar (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. VII. Tell how many total electrons each of the following atoms or ions has. Then match the 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). Mg2+ Br- Ca Ti2+ K+ F- Kr


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