Advertisements
Advertisements
प्रश्न
Give reason.
Noble gases possess relatively large atomic size.
उत्तर
- Noble gases have completely filled valence shell i.e., complete octet (except He with complete duplet).
- Since their valence shell contains eight electrons, they experience greater electronic repulsion and this results in increased atomic size (atomic radii) of the noble gas elements.
Hence, noble gases possess relatively large atomic size.
APPEARS IN
संबंधित प्रश्न
Explain the following.
The atomic radii of Cl, I, and Br are 99, 133, and 114 pm, respectively.
Explain the following.
13Al is a metal, 14Si is a metalloid and 15P is a nonmetal.
Explain the following.
Cu forms coloured salts while Zn forms colourless salts.
Answer the following.
Ionization enthalpy of Li is 520 kJ mol-1 while that of F is 1681 kJ mol-1. Explain.
Answer the following.
Why the second ionization enthalpy is greater than the first ionization enthalpy?
Answer the following.
Why the elements belonging to the same group do have similar chemical properties?
Answer the following.
Explain electronegativity and electron gain enthalpy. Which of the two can be measured experimentally?
Choose the correct option.
Consider the elements B, Al, Mg, and K predict the correct order of metallic character:
Choose the correct option.
The lanthanides are placed in the periodic table at
Choose the correct option.
If the valence shell electronic configuration is ns2np5, the element will belong to
Answer the following question.
For the following pair, indicate which of the two species is of large size:
Fe2+ or Fe3+
Answer the following question.
For the following pair, indicate which of the two species is of large size:
Mg2+ or Ca2+
Answer the following question.
Select the smaller ion form the following pair:
K+, Li+
Answer the following question.
Select the smaller ion form the following pair:
N3–, F–
With the help of a diagram answer the questions are given below:
- Which atom should have smaller ionization energy, oxygen, or sulphur?
- The lithium forms +1 ions while beryllium forms +2 ions?
Define ionic radius
Define electronegativity
How does ionization enthalpy vary down the group and across a period?
How the atomic size vary in a group and across a period? Explain with suitable example.
Give reason.
Alkali metals have low ionization enthalpies.
Give reason.
Fluorine has less electron affinity than chlorine.
