Melting and Boiling points depend on _?
Correct answer: B. Number of Unpaired electrons
- A. Number of electrons
- B. Number of Unpaired electrons
- C. Number of Paired electrons
- D. Number of Protons
Explanation
Melting point: The constant temperature at which a solid changes into liquid is called melting point. Example : Ice cubes start melting and change state from a solid to liquid at the temperature of 0°C.Boiling point: The temperature at which the pressure exerted by the surroundings upon a liquid is equaled by the pressure exerted by the vapor of the liquid; under this condition, addition of heat results in the transformation of the liquid into its vapor without raising the temperature. If the number of unpaired electrons increases then metallic bond becomes stronger and hence the metal elements show high melting and boiling point.
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About Electronic Configuration
Electronic configuration describes how electrons occupy shells, subshells and orbitals around an atom. Questions use the Aufbau principle, Pauli exclusion principle and Hund's rule to write configurations, identify valence electrons, form ions and explain periodic trends, including common exceptions such as chromium and copper.
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