alleryIn the modern periodic table, elements of which group have a complete outermost shell?
A18th group
B15th group
C16th group
D17th group
Answer & Solution
Correct answer: A. 18th group
1. A complete outer shell means a stable octet (or duplet for helium).
2. The noble gases have fully filled outer shells.
3. The noble gases form Group 18 of the periodic table.
_Source: RRB Group D CEN-02/2018 PYQ, Q.9._
Keep practising Chemical Thermodynamics
Browse all Chemical Thermodynamics questions for AP Intermediate 1st Year, or explore more Chemistry topics.
Related questions
A process whose enthalpy and entropy changes share the same arithmetic sign will show:At minus 10.00 degrees Celsius the entropy change of the universe for melting is negative,Melting is described as spontaneous at 10.00 degrees Celsius because at that temperature:K_sp of a sparingly soluble salt AB at 25 °C is 4 × 10⁻¹⁰. Molar solubility s of AB is:A buffer solution is most resistant to pH change when:K_w (ionic product of water at 25 °C) is:The pH of a 0.01 M HCl solution is:For an exothermic reaction at equilibrium, raising the temperature: