Interpretation:
The compound formed between elements C (Rb) and D (N) needs to be determined.
Concept introduction:
Molecules are bound together by different types of bonds namely ionic and covalent. Ionic bonds are formed when there is complete transfer of electrons from one atom to another. These atoms either lose or gain electrons to become negatively or positively charged ions. The forces of attraction between these ions causes the ionic bond formation.

Answer to Problem 68A
The compound formed between elements C and D is
Explanation of Solution
The given periodic table wherein elements C and D are marked.
From the table, it can be seen that element C belongs to group 1 while element D belongs to group 15.
Element C is Rubidium and element D is Nitrogen.
Rubidium has
Nitrogen has atomic number of 7 with electronic configuration as
Hence, the compound formed between Rubidium and Nitrogen is
The compound between element C and element D is
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