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Standard XII
Chemistry
Atomic Number and Mass Number
Anything that...
Question

Anything that influences the valence electrons will affect the chemistry of the element. Nuclear mass effects chemistry of valence electrons.

A
True
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B
False
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Solution

The correct option is B False

Nuclear mass includes the mass of protons and the mass of neutrons. It does not affect the valence shell. The following factors affect the valence shell.(a) Valence principle quantum number (n)(b) Nuclear charge (Z)(d) Number of core electrons


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Q.

Anything that influences the valence electrons will affect the chemistry of the element. Which one of the following factors does not affect the valence shell?
(a) Valence principal quantum number (n)
(b) Nuclear charge (Z)
(c) Nuclear mass
(d) Number of core electrons.

Q.

Anything that influences the valence electrons will affect the chemistry of the element. Which one of the following factors does not affect the valence shell?

(a) Valence principal quantum number (n)

(b) Nuclear charge (Z)

(c) Nuclear mass

(d) Number of core electrons.

Q. Anything that influences the valence electrons will affect the chemistry of the element. Which one of the following factors does not affect the valence shell?
Q. Consider the following statements and arrange in the order of true/false as given in the codes.
S1: In the modern periodic table each block contains a number of columns equal to the number of electrons that can occupy that sub-shell.
S2: the greatest increase in ionization enthalpy is experienced on the removal of the electron from the core noble gas configuration.
S3: The size of the isoelectronic species is affected by electron-electron interaction in the outer orbitals.
S4: Anything that influences the valence electrons will affect the chemistry of the element and the valence shell is not affected by nuclear mass.
Q. The nuclear charge actually experienced by an electron is termed as the effective nuclear charge. The effective nuclear charge Z* actually depends on the 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>p>d>f (for the same value of n)
The phenomenon in which penultimate shell electrons act as screen or shield 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 the nucleus. It is thus evident that more is the shielding effect, lesser is the effective nuclear charge and lesser is the ionization energy.
Which of the following valence electron experience maximum effective nuclear charge?
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