તત્વો $A$ અને $B$ ની નીચેની આયનીકરણ એન્થાલ્પી ઓ ધ્યાનમાં લો.
તત્વો
આયનીકરણ
એન્થાલ્પી
$(kJ/mol)$
$1^{st}$
$2^{nd}$
$3^{rd}$
$A$
$899$
$1757$
$14847$
$B$
$737$
$1450$
$7731$
નીચેના પૈકી કયુ વિધાન સાચુ છે ?
JEE MAIN 2017, Diffcult
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c Generally, the ionization enthalpies or energy increases from left to right in a period and decreases from top to bottom in a group. Several factor such as atomic radius, nuclear charge, shielding effect are responsible for change of ionization enthalpies Here, $1^{st}$ ionization enthalpy of $A$ and $B$ is greater than group $I$ ($Li\, 520\, kJ\,mol^{-1}$ to $Cs\,374\, kJ\,mol^{-1}$), which means element $A$ and $B$ belong to group $-2$ and all three given ionization enthalpy values are less for element $B$ means $B$ will come below $A$.
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