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Assertion: Group 14 elements have relatively high melting and boiling points.
Reason: Group 14 elements have four valence electrons, which enables them to form strong covalent bonds with each other through the sharing of electrons.
Both A and R are true and R is the correct explanation of A
Both A and R are true but R is not the correct explanation of A.
A is true but R is false.
A is false but R is true.
Answers (1)
The assertion is true, and the reason is a valid explanation for it. Group 14 elements include carbon, silicon, germanium, tin, and lead, and they all have relatively high melting and boiling points compared to many other elements.
The reason for this is that group 14 elements have four valence electrons in their outermost energy level, which allows them to form strong covalent bonds with each other through the sharing of electrons. These covalent bonds are very strong and require a large amount of energy to break, which results in high melting and boiling points. Additionally, as we move down the group from carbon to lead, the atomic size increases, which results in weaker interatomic forces and lower melting and boiling points.
Therefore, the assertion that group 14 elements have relatively high melting and boiling points is true, and the reason that they have four valence electrons and can form strong covalent bonds with each other is a valid explanation for it.
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