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44. You were given three unknown substances  illustrated below. How can you classify them?1 pointThey are different atoms.They are all the same atoms.They are isotopes of the same atom.They are isotopes of different atoms.Clear selection45. The electron configuration of an atom is 1s2 2s2 2p6 3s2 3p6 4s2. How is this atom classified in the periodic table?1 pointAlkali metalsAlkaline earth metalsBoron groupHalogens group46. Aluminum belongs to Group III A ( Boron Group) and Period 3 in the Periodic table. Which is the correct electron configuration of aluminum?1 point1s2 2s2 2p6 3s21s2 2s2 2p6 3s2 3p11s2 2s2 2p41s2 2s2 2p6 3s147. Which of the following atoms is the most reactive?1 pointLiNaBeMg48. What happens to the size of the atom as you go down the group?1 pointDecreasesIncreasesReduced to halfRemains the same49. Why are helium gases used in party balloons and meteorological balloons than hydrogen gases?1 pointIts non-toxic.It is lighter than air.It diffuses faster in the air.It does not readily react to other substances.50. Computer hard disks, thermocouples, optical fibers, liquid crystal displays (LCD), spark plugs, pacemakers and dental fillings requires a metal that is non-reactive in order for products to be corrosive resistant even at higher temperatures. Considering the reactivity series, which among the following will you use in creating the given equipment/ materials?1 pointAluminumCopperPlatinumSilve

Question

  1. You were given three unknown substances  illustrated below. How can you classify them?1 pointThey are different atoms.They are all the same atoms.They are isotopes of the same atom.They are isotopes of different atoms.Clear selection45. The electron configuration of an atom is 1s2 2s2 2p6 3s2 3p6 4s2. How is this atom classified in the periodic table?1 pointAlkali metalsAlkaline earth metalsBoron groupHalogens group46. Aluminum belongs to Group III A ( Boron Group) and Period 3 in the Periodic table. Which is the correct electron configuration of aluminum?1 point1s2 2s2 2p6 3s21s2 2s2 2p6 3s2 3p11s2 2s2 2p41s2 2s2 2p6 3s147. Which of the following atoms is the most reactive?1 pointLiNaBeMg48. What happens to the size of the atom as you go down the group?1 pointDecreasesIncreasesReduced to halfRemains the same49. Why are helium gases used in party balloons and meteorological balloons than hydrogen gases?1 pointIts non-toxic.It is lighter than air.It diffuses faster in the air.It does not readily react to other substances.50. Computer hard disks, thermocouples, optical fibers, liquid crystal displays (LCD), spark plugs, pacemakers and dental fillings requires a metal that is non-reactive in order for products to be corrosive resistant even at higher temperatures. Considering the reactivity series, which among the following will you use in creating the given equipment/ materials?1 pointAluminumCopperPlatinumSilve
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Solution

  1. Without any illustration or further information, it's impossible to classify the three unknown substances.

  2. The electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 corresponds to the element Calcium, which is an Alkaline earth metal.

  3. The correct electron configuration for Aluminum (which belongs to Group III A and Period 3 in the Periodic table) is 1s2 2s2 2p6 3s2 3p1.

  4. Among Li, Na, Be, and Mg, Sodium (Na) is the most reactive.

  5. As you go down a group in the periodic table, the size of the atoms increases.

  6. Helium is used in party balloons and meteorological balloons rather than hydrogen because it is lighter than air and does not readily react with other substances, making it safer.

  7. Considering the reactivity series, Platinum would be the best choice for creating equipment/materials that need to be corrosion-resistant even at higher temperatures. Platinum is a noble metal and is known for its excellent resistance to corrosion.

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