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Trends in Group-18 Elements - 2 Video Lecture | Chemistry Class 12 - NEET

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FAQs on Trends in Group-18 Elements - 2 Video Lecture - Chemistry Class 12 - NEET

1. What are the Group-18 elements?
Ans. Group-18 elements, also known as noble gases, are a group of chemical elements that include helium, neon, argon, krypton, xenon, and radon. These elements are characterized by their low reactivity and stable electronic configurations.
2. What are the trends in the properties of Group-18 elements?
Ans. The properties of Group-18 elements exhibit certain trends as we move down the periodic table. These trends include an increase in atomic size, an increase in boiling points, an increase in density, and a decrease in ionization energy.
3. How do the boiling points of Group-18 elements change as we move down the group?
Ans. The boiling points of Group-18 elements increase as we move down the group. This is because the size and atomic mass of the atoms increase, leading to stronger intermolecular forces of attraction. These stronger forces require more energy to break, resulting in higher boiling points.
4. Why do Group-18 elements have low reactivity?
Ans. Group-18 elements have low reactivity due to their stable electronic configurations. These elements have completely filled outer electron shells, making them highly stable and unlikely to form chemical bonds with other elements. This stability is a result of the noble gases' full valence electron configurations.
5. How does the ionization energy change in Group-18 elements?
Ans. The ionization energy, which is the energy required to remove an electron from an atom, generally decreases as we move down Group-18 elements. This is because the atomic size increases, leading to a greater distance between the outermost electrons and the positively charged nucleus. As a result, the attraction between the electrons and the nucleus weakens, making it easier to remove an electron.
150 videos|378 docs|213 tests
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