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(C) The chemistry of an element is primarily determined by its valence electrons. $(a)$ The principal quantum number $(n)$ determines the energy and s

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Nuclear mass

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(C) The chemistry of an element is primarily determined by its valence electrons. $(a)$ The principal quantum number $(n)$ determines the energy and size of the valence shell. $(b)$ The nuclear charge $(Z)$ determines the effective nuclear charge experienced by the valence electrons. $(d)$ The number of core electrons determines the shielding effect,which influences the effective nuclear charge. $(c)$ Nuclear mass depends on the number of protons and neutrons in the nucleus. While it affects the physical properties like density or isotopic behavior,it does not significantly influence the electronic configuration or the chemical behavior of the valence shell.

List-$I$	List-$II$
$(1)$ Active non-metal with high electron gain enthalpy.	$(A)$ $Na$
$(2)$ Soft metal with low ionization enthalpy.	$(B)$ $Sb$
$(3)$ Metalloid that forms ${M_2}{O_3}$ type oxide.	$(C)$ $He$
$(4)$ Chemically inert gas.	$(D)$ $Cl$

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.

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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.