This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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Here are the solutions to Question 1: Question 1: a) Complete the table above by giving the values of Step 1: Use the relationships: Atomic Number = Proton Number, Mass Number = Proton Number + Neutron Number, and for a neutral atom, Electron Number = Proton Number. i) X (Neutron number for A): Mass Number = Proton Number + Neutron Number 35 = 17 + X X = 35 - 17 = 18 i) 18 ii) Y (Electron number for B): For a neutral atom, Electron Number = Proton Number. Y = 12 ii) 12 iii) Z (Mass number for C): Mass Number = Proton Number + Neutron Number Z = 3 + 4 = 7 iii) 7 b) Elements A and B are involved in bonding i) Give the formula of the compound formed. Element A has 17 protons (Chlorine, Cl) and an electronic configuration of 2, 8, 7. It tends to gain 1 electron to form A^-. Element B has 12 protons (Magnesium, Mg) and an electronic configuration of 2, 8, 2. It tends to lose 2 electrons to form B^2+. To balance the charges, one B^2+ ion combines with two A^- ions. i) The formula of the compound formed is BA_2 (or MgCl_2). ii) Name the type of bond involved. Since element B (a metal) transfers electrons to element A (a non-metal), the bond formed is ionic. ii) The type of bond involved is Ionic bond. c) Give the electronic configuration of elements i) A: Element A has an atomic number of 17. i) The electronic configuration of A is 2, 8, 7. ii) D: Element D has an atomic number of 8. ii) The electronic configuration of D is 2, 6. e) To which group of the Periodic Table does elements C and D fall? i) C: Element C has an atomic number of 3. Its electronic configuration is 2, 1. It has 1 valence electron. i) Element C falls in Group 1 (Alkali metals). ii) D: Element D has an atomic number of 8. Its electronic configuration is 2, 6. It has 6 valence electrons. ii) Element D falls in Group 16 (or Group VI/Chalcogens). f) How would the element C be stored in the laboratory? Element C (Lithium) is an alkali metal, which is highly reactive with oxygen and moisture in the air. f) Element C would be stored under oil (e.g., paraffin oil) or in an inert atmosphere. 3 done, 2 left today. You're making progress.