The electronegativity of the given elements increases in the order.
The first ionisation enthalpies of $$\mathrm{Mg}$$ and $$\mathrm{Al}$$ can be expected to be ............ .
Which of the following statements is/are correct?
1. Mercury is the only metal that exists as liquid at room temperature.
2. Among non-metals, carbon has the highest melting point.
3. Hydrogen is the most abundant element in the universe.
4. Oxygen is the most abundant element in the Earth's crust.
A covalent molecule '$$X Y^{\prime}$$' is found to have a dipole moment of $$1.5 \times 10^{-29} \mathrm{C} \cdot \mathrm{m}$$ and $$a$$ bond length of $$150 ~\mathrm{pm}$$. The percent ionic character of the bond will be
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