correct order of melting point of group 1
Answers
Answer:
All these are p-block elements. The elements carbon and silicon are typical non-metals. On the other hand, germanium is a semi-metal whereas tin and lead are typical metals. Thus, it can be said that down the carbon group, the character of the elements shifts from non-metallic to metallic.
-All the elements above lead usually form covalent bonding with other surrounding atoms. At the top of the group, carbon forms large covalent network structures in its two most familiar allotropes of diamond and graphite. These types of covalent structures are also found in silicon and germanium.
-Covalent structure is also found in one allotrope of tin called grey tin. But in another allotrope called white tin, tin shows distorted close packed metallic bonding. Thus, in heavier elements of the group such as in lead, the atoms are arranged in a close-packed 12- coordinated metallic structure. Thus, we can understand that as we move down towards the group, the metallic bonding structure tends to become more stable.
-Since covalent and metallic bonding lead to higher melting points, the melting point values of the group decreases from carbon to lead due to decrease in attractive forces. Very high melting points of carbon and silicon are due to their tendency to form giant covalent molecules. Tin and lead will have lower melting points but lead, as an exception, has higher melting point than tin due to the distortion in tin’s close-packed 12-coordinated structure.
So, the correct order will be C>Si>Ge>Pb>Sn.
Answer:
What is the pattern in melting point of Group 1?
Generally the melting point of the alkali metals decreases down the group. This is because as the ions get larger the distance between the bonding electrons and the positive nucleus gets larger and reduces the overall attraction between the two. For similar reasons the electronegativity decreases.
Explanation:
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