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.
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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.
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