A) metallic bonding
B) van der Waals' bonding
C) ionic bonding
D) covalent bonding
Correct Answer: A
Solution :
Metallic bonding is formed due to attraction of valence (free) electrons with the positive ion cores. Their conductivity decreases with rise of temperature. When visible light falls on a metallic crystal, the electrons of atom absorb visible light, so they are opaque to visible light. However, some orbital electrons absorb energy and reach to excited state. They then return to their normal state, remitting light of same frequency.
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