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Answer the following question. What are the valence electrons? - Chemistry

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प्रश्न

What are the valence electrons?

एक पंक्ति में उत्तर

उत्तर

Electrons present in the outermost shell of the atom of an element are called valence electrons.

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Periodic Trends in Elemental Properties
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अध्याय 7: Modern Periodic Table - Exercises [पृष्ठ १०९]

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बालभारती Chemistry [English] 11 Standard
अध्याय 7 Modern Periodic Table
Exercises | Q 5. (G). i. | पृष्ठ १०९

संबंधित प्रश्न

Explain the following.

The ionic radii of FΘ and Naare 133 and 98 pm, respectively.


Explain the following.

13Al is a metal, 14Si is a metalloid and 15P is a nonmetal.


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.

Explain the screening effect with a suitable example.


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


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:

  1. Which atom should have smaller ionization energy, oxygen, or sulphur?
  2. The lithium forms +1 ions while beryllium forms +2 ions?

Define ionic radius


Define electronegativity


Define ionization enthalpy.


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.


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