Given below are the atomic numbers of some group 14 elements. The atomic number of the element with the lowest melting point is:
Show Hint
- 14
- 6
- 82
- 50
The Correct Option is D
Approach Solution - 1
The question requires us to identify the element from Group 14 of the periodic table that possesses the lowest melting point, based on the given atomic numbers. The atomic numbers listed correspond to specific elements as follows:
- Carbon (C) - Atomic number 6
- Silicon (Si) - Atomic number 14
- Tin (Sn) - Atomic number 50
- Lead (Pb) - Atomic number 82
Group 14 elements include Carbon, Silicon, Germanium, Tin, and Lead. One distinctive property of these elements is their varying melting points. Generally, upon moving down the group, the melting points tend to decrease with some local exceptions due to structural differences.
Let's compare the melting points based on typical properties of the elements:
- Carbon (C) has a very high melting point as it exists as graphite or diamond.
- Silicon (Si) has a high melting point due to its covalent bonding structure.
- Tin (Sn) exists in several allotropes, one of which, called grey tin, has a low melting point.
- Lead (Pb) has a relatively low melting point but still higher than grey tin.
Among the given elements, Tin has the allotrope with the lowest melting point (especially grey tin, which is metallic and has a lower melting point compared to other elements mentioned).
Thus, the element with the lowest melting point among the given atomic numbers is Tin (Atomic number 50).
Correct Answer: 50
Approach Solution -2
Thus, the correct answer is (4) 50.
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The correct orders among the following are:
[A.] Atomic radius : \(B<Al<Ga<In<Tl\)
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[C.] Density : \(Tl<In<Ga<Al<B\)
[D.] 1st Ionisation Energy :
In\(<Al<Ga<Tl<B\)
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