Do the melting and boiling points of the halogens increase or decrease as you go down the group?
Question
Do the melting and boiling points of the halogens increase or decrease as you go down the group?
Solution 1
The melting and boiling points of the halogens increase as you go down the group. Here's why:
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Halogens are located in Group 7 of the Periodic Table. This group includes elements like Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I), and Astatine (At).
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As you move down the group, the number of electron shells in each halogen increases. This means that the size of the atoms also increases.
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Larger atoms have more electrons. These additional electrons lead to stronger London dispersion forces (a type of van der Waals force) between the atoms.
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The stronger these intermolecular forces, the more energy is required to overcome them and change the state of the substance (from solid to liquid, or liquid to gas).
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Therefore, both the melting and boiling points increase as you go down the group of halogens.
Solution 2
The melting and boiling points of the halogens increase as you go down the group. Here's why:
-
Halogens are located in Group 7 of the Periodic Table. This group includes elements like Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I), and Astatine (At).
-
As you move down the group, the number of electron shells in each halogen increases. This means that the size of the atoms also increases.
-
Larger atoms have more electrons, which means there are stronger London dispersion forces (a type of intermolecular force) between the atoms.
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Stronger intermolecular forces require more energy to overcome. This means that the melting and boiling points increase as you go down the group.
So, in summary, the melting and boiling points of halogens increase as you go down the group due to an increase in the strength of the London dispersion forces.
Similar Questions
Complete the following sentence with either increases or decreases.The melting and boiling points of halogens ………….. as you go down the group.Give your answer as increases or decreases only.
Which of the following is NOT a property of the halogens (group 7 elements)?Low densityLow melting pointConduct electricityReactivity decreases down the group
Group 7 elements react by gaining an electron in their outer shell. Why does their reactivity decrease as you go down the group?The outer shell becomes further away from the nucleus, so it is easier to gain an electronThe outer shell becomes closer to the nucleus, so it is harder to gain an electronThe outer shell becomes further away from the nucleus, so it is harder to gain an electronThe outer shell becomes closer to the nucleus, so it is easier to gain an electron2Which halogen is a liquid at room temperature?BromineChlorineIodineFluorine3The halogens exist as:Positive ionsNegative ionsMolecules made of pairs of atoms joined by a covalent bondMolecules made of pairs of atoms joined by an ionic bond4A chemical reaction in which a more reactive element takes the compound away from a less reactive element is known as:CombustionReductionDisplacementOxidation5What will happen when chlorine solution is added to sodium iodide solution?Iodine is producedChlorine gas is producedAn explosionNo reaction6Which of the following is a balanced symbol equation for the reaction of chlorine solution with sodium bromide solution?Cl + NaBr → NaCl + BrCl2 + NaBr → NaCl + Br22Cl + 2NaBr → 2NaCl + 2BrCl2 + 2NaBr → 2NaCl + Br2
Complete the following sentence with either increases or decreases.The reactivity of halogens ………….. as you go down the group.Give your answer as increases or decreases only.
What experimental evidence supports the hypothesis that impurities lower the melting point while increasing the boiling point of a substance?
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