Question -
The elements of groups,1, 2, 13, 14, 15, 16 and 17 are collectively called
Options:
A .  Noble gases
B .  Representative or normal elements
C .  Transition elements
D .  Inner transition elements
Answer: Option B : B In the modern periodic table,elements are classified into representative elements, transition elements, inner transition, inner gases based on electronic configuration. When the group numberof the elements represents the number of valence electrons they arecalledrepresentative elements. Group - 1 (1A) - 1 valence electrons 2 (IIA) - 2 valence electrons 3 (IIIA) - 3 valence electrons 4 (IVA) - 4 valence electrons 15 (VA) - 5 valence electrons 16 (VIA) - 6 valance electrons 17 (VIIA) - 7 valence electrons
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