The lowest melting point among these four elements is of;
Correct answer: C. Mg
- A. Be
- B. Ca
- C. Mg
- D. Sr
Explanation
Among the elements Be, Mg, Ca, and Sr, Magnesium (Mg) has the lowest melting point. Its melting point is 922 K (649 °C), while the melting points of the other elements are: Beryllium (Be): 1551 K (1287 °C) Calcium (Ca): 1112 K (839 °C) Strontium (Sr): 1042 K (768 °C) The reason for this variation in melting points is due to the different crystal structures of the elements. Magnesium has a hexagonal close-packed (HCP) crystal structure, while the other elements have body-centered cubic (BCC) structures. The HCP structure is less tightly packed than the BCC structure, which means that the atoms in magnesium are held together with less force. This results in a lower melting point for magnesium. Beryllium, Calcium, and Strontium have higher melting points compared to magnesium due to their different crystal structures and packing arrangements.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About s-Block and p-Block Elements
The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
Practise s-Block and p-Block Elements
1,359 free s-Block and p-Block Elements MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More s-Block and p-Block Elements questions
Melting points of group IIA elements are considerably higher than those of group IA elements because;
In the pidgeon process, Mg is produced by:
High purity copper is obtained by-
In which group melting and boiling point decreases down the group:
The elements of group IA react violently with water and make the solution:
What is the nature of the reaction Li2O+H2→ 2LiOH(aq)?