Question:
Noble gases are group of elements which exhibit very
Noble gases are group of elements which exhibit very
Updated On: Jun 26, 2023
- High chemical activity
- Low chemical activity
- Minimum electronegativity
- Considerable paramagnetic property
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The Correct Option is B
Approach Solution - 1
Noble gases exhibit low chemical activity
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We must keep in mind that the noble gas, as the name implies, is stable yet reacts under certain severe conditions. The characteristics of noble gases may be effectively explained by their atomic structure based on electron dispersion. The electrons in the valence outermost shell are full and so stable, with a minimal proclivity to participate in chemical processes. The octet rule, which was developed for the distribution of electrons in various shells of an atom, determined that an octet of electrons, i.e. eight electrons in an atom's outermost shell, was the most stable configuration for that atom. Because they did not require electrons to complete the octet of their valence shell, they were unreactive with other elements due to their electron distribution.
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Notes on Group 18 Elements
Concepts Used:
Group 18 Elements
The Group 18 elements, also known as noble gases except for Helium, are inert in nature because they have completely filled ns2 np6 electronic configuration in their valence shells. These gases also have high ionization enthalpy and more positive electron gain enthalpy. All these elements are chemically unreactive i.e. they don’t form many compounds.
Group 18 Elements consist of six elements. They are as mentioned below:
- Helium (He)
- Neon (Ne)
- Argon (Ar)
- Krypton (Kr)
- Xenon (Xe)
- Radon (Rn)
Electronic Configuration:
The electronic configuration of Group 18 Elements along with their symbol and atomic number is given in the tabulated form below:
Trends in the Atomic Properties:
- Atomic Radius: The nuclear radii increment on moving down the group with increasing nuclear number. This is a result of the expansion of another shell at each progressive element on moving down the group.
- Electron Gain Enthalpy: Group 18 elements exhibit very stable electronic configurations. They do not have any tendency to accept an electron.
- Ionisation Potential: They have high ionisation potentials, thanks to their closed electronic configurations. This value decreases on moving down the group due to an expansion in the nuclear size.