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The effective nuclear charge across the ...

The effective nuclear charge across the period (from left to right)

A

1. Increases

B

2. Decreases

C

3. First increases and then decreases

D

4. First decreases and then increases

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A
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How valency of elements changes : Along the period from left to right

Give a reason for the following: Ionisation potential increases across a period, from left to right.

Nuclear charge actually experienced by an electron is termed as effective nuclear charge. The effective nuclear charge Z^(**) actuall ydepends on type of shell and orbital in which electron is actually present. The relative extent to which the various orbitals penetrate the electron clouds of other orbitals is s gt p gt d gt f (for the same value of n) The phenomenon in which penultimate shell electrons act as screen or sheild in between nucleus and valence shell electrons and thereby reducing nuclear charge is known as shielding effect. the penultimate shell electrons repel the valence shell electron to keep them loosely held with nucleus. it is thus evident that more is the shielding effect, lesser is the effective nuclear charge and lesser is the ionization energy. Q. Which of the following valence electron experience maximum effective nuclear charge?

Nuclear charge actually experienced by an electron is termed as effective nuclear charge. The effective nuclear charge Z^(**) actuall ydepends on type of shell and orbital in which electron is actually present. The relative extent to which the various orbitals penetrate the electron clouds of other orbitals is s gt p gt d gt f (for the same value of n) The phenomenon in which penultimate shell electrons act as screen or sheild in between nucleus and valence shell electrons and thereby reducing nuclear charge is known as shielding effect. the penultimate shell electrons repel the valence shell electron to keep them loosely held with nucleus. it is thus evident that more is the shielding effect, lesser is the effective nuclear charge and lesser is the ionization energy. Q. Which of the following is not concerned to effective nuclear charge?

Nuclear charge actually experienced by an electron is termed as effective nuclear charge. The effective nuclear charge Z^(**) actuall ydepends on type of shell and orbital in which electron is actually present. The relative extent to which the various orbitals penetrate the electron clouds of other orbitals is s gt p gt d gt f (for the same value of n) The phenomenon in which penultimate shell electrons act as screen or sheild in between nucleus and valence shell electrons and thereby reducing nuclear charge is known as shielding effect. the penultimate shell electrons repel the valence shell electron to keep them loosely held with nucleus. it is thus evident that more is the shielding effect, lesser is the effective nuclear charge and lesser is the ionization energy. Q. Which of the following valence electron experience maximum effective nuclear charge?

Nuclear charge actually experienced by an electron is termed as effective nuclear charge. The effective nuclear charge Z^(**) actuall ydepends on type of shell and orbital in which electron is actually present. The relative extent to which the various orbitals penetrate the electron clouds of other orbitals is s gt p gt d gt f (for the same value of n) The phenomenon in which penultimate shell electrons act as screen or sheild in between nucleus and valence shell electrons and thereby reducing nuclear charge is known as shielding effect. the penultimate shell electrons repel the valence shell electron to keep them loosely held with nucleus. it is thus evident that more is the shielding effect, lesser is the effective nuclear charge and lesser is the ionization energy. Q. Ionzation enegy is not influenced by:

Nuclear charge actually experienced by an electron is termed as effective nuclear charge. The effective nuclear charge Z^(**) actuall ydepends on type of shell and orbital in which electron is actually present. The relative extent to which the various orbitals penetrate the electron clouds of other orbitals is s gt p gt d gt f (for the same value of n) The phenomenon in which penultimate shell electrons act as screen or sheild in between nucleus and valence shell electrons and thereby reducing nuclear charge is known as shielding effect. the penultimate shell electrons repel the valence shell electron to keep them loosely held with nucleus. it is thus evident that more is the shielding effect, lesser is the effective nuclear charge and lesser is the ionization energy. Q. Ionzation enegy is not influenced by:

Calculate the effective nuclear charge experienced by the 4s -electron in potassium atom (Z = 19) .

Generally electron gain enthalpy _____________ on going down a group, and _____________ on going across the period from left to right.

(a) Electropositive nature of the element(s) increases down the group and decreases across the period (b) Electronegativity of the element decreases down the group and increases across the period (c) Atomic size increase down the group and decreases across a period (left to right) (d) Metallic character increases down the group and decreases across a period On the basis of the above trends of the periodic table, answer the following about the electron with atomic number 3 to 9 (a) Name the most electropositive element among them (b) Name the most electronegative element (c) Name of the element with smallest atomic size (d) Name the element which is a metalloid (e) Name the element which shows maximum valency.

AAKASH INSTITUTE ENGLISH-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES-Assignment (Section -A)
  1. The group of elements in which the last electron is present the anti-p...

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  2. Which general electronic configuration of the element does not represe...

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  3. Find the incorrect statement.

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  4. The effective nuclear charge across the period (from left to right)

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  5. Which electronic configuration of an element has abnormally high diffe...

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  6. Which of the following has the highest negative electron gain entahlpy...

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  7. The outermost electronic configuration of the most electronegative ele...

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  8. Match the elements given in column (I) with the most appropriate expec...

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  9. Electronegativity of the elements O,F,S and Cl increases in the order

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  10. Valence electrons in the atom of element A is 4 and in the element B i...

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  11. Which orbital diagram gives an insight ionization energy ?

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  12. The largest atomic radius will be of

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  13. The order of increasing atomic radii is

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  14. Highest amount of energy will be required for the removal of electron ...

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  15. Arrangement of atoms according to their increasing ionization energy i...

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  16. Pick the incorrect statement about the factors affecting ionization en...

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  17. What will be the correct order of size for the given elements ?

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  18. In which element the electrons will be experiencing the highest effect...

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  19. Which of the following is not a representative element ?

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  20. Correct order of 1st ionisationpotential (IP) among following elements...

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