Chemistry 1: Classification of Elements Worksheet



Classify each element as a metal, non-metal or metalloid based on it’s position on the Periodic Table. Also state the group/family it is in. Classifications: Metal (M) Non-Metal (NM) Metalloid (MO)Groups: halogen * transition metal * alkali metal * alkaline earth metal * noble gas * non-metal * other metalNiobium ___________________Radon ____________________Radium ______________________Nitrogen___________________Silver _____________________Bismuth _____________________Iodine _____________________Neon _____________________Lithium ______________________Osmium ___________________Silicon ____________________Antimony ____________________Bromine __________________Sulfur ____________________Lead ________________________Uranium __________________Rubidium _________________Calcium ______________________Each numbered exercise contains element clues that will help you fill-in the blanks to figure out the missing word. Use the symbol for each element in each blank.1. _________ _________ _________Transition Metal number 24A halogen with 53 protonsFirst element in family 132. _________ _________ _________An active alkaline earth metal with 56 protonsThe alkali metal of period 3The metal element that makes up table salt 3. _________ _________ _________The first of the alkali metalsThe first element of family 16A period 2 nonmetal with 5 valence electrons 4. _________ _________ _________The first element in the actinide seriesPeriod 2 nonmetal with 6 valence electronsThe last of the noble gases 5. _________ _________ _________ _________A transition metal with atomic mass of 183.8,used in incandescent light bulbs.Period 4, Group 15 elementThe second element in Group 15Period 3 element with 6 valence electronsPredict which of the following ions is likely to form in nature: HINT: Which column (group / family) is each one in? Think about what that tells you about the element…Na2+ __________________Cl 1+ __________________Ca 2+ _________________Br 1- ____________________Ne 1- ___________________Ne 1+ __________________Explain why chlorine (Cl) is very reactive, and why argon (Ar), is unreactive.Why are valence electrons important to the Periodic Table?Explain the difference between the Mass Number and the Atomic Mass for an element.Analyze the following pairs of elements, and determine whether each pair has similar or different reactivities.Potassium (K) and rubidium (Rb) ______________________________ Calcium (Ca) and Barium (Ba) ________________________________Sodium (Na) and Chlorine (Cl) ________________________________Helium (He) and Krypton (Kr) _________________________________Hydrogen (H) and Oxygen (O) ________________________________Identifying Unknown ElementsThis element is in the same family as lead and it has fewer protons than sodium. _______________________This element has an atomic number that is one greater than platinum. ________________________________This element has the most protons of any element in group 15. _____________________________________This element has more than 50, but less than 75, protons and it is in group 17. _________________________This group 2 element has fewer protons than bromine, but more protons than sulfur. ___________________This element has the lowest atomic number of any group 16 element. ________________________________This element has an atomic number that is double the atomic number of silicon. _______________________This element has more valence electrons than oxygen, fewer valence electrons than neon, more protons than sodium, but fewer protons than argon. ________________________________________________________This element has an atomic number lower than that of aluminum and one less valence electron than the group 16 elements ______________________________________________________________________________This element is in group 1 and has a high atomic number than chlorine, but a lower atomic number than bromine. ________________________________________________________________________________________ ................
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