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Periodic Properties And Variation Of Properties Physical And Chemical — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryPeriodic Properties And Variation Of Properties Physical And Chemical1 Mark
Question
A, B, C are three elements in which B is an inert gas other than helium.With this information complete the following table.
ElementAtomic numberNo. of electrons in the valence shellGroup to which the element belongs
AZ - 1
BZ
CZ + 1
Also, explain the following : Ionization energy of element C is less than that of element A.
✓

Answer

 
Element Atomic number No. of electrons in the valence shell Group to which the element belongs
A Z - 1
B Z 8 18
C Z + 1
Since C belongs to group 1 it has less ionization energy than A as atomic size of group 1 elements is more than that of group 17.

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