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प्रश्न
What are the valence electrons?
उत्तर
Electrons present in the outermost shell of the atom of an element are called valence electrons.
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संबंधित प्रश्न
Explain the following.
The ionic radii of FΘ and Na⊕ are 133 and 98 pm, respectively.
Explain the following.
Cu forms coloured salts while Zn forms colourless salts.
Answer the following.
Explain the screening effect with a suitable example.
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.
Which of the following pairs is isoelectronic?
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
Define ionization enthalpy.
Name the factors on which ionization enthalpy depends?
How does ionization enthalpy vary down the group and across a period?
Give reason.
Alkali metals have low ionization enthalpies.
Give reason.
Inert gases have exceptionally high ionization enthalpies.
Give reason.
Fluorine has less electron affinity than chlorine.
Give reason.
Noble gases possess relatively large atomic size.
