Concept explainers
(a)
Interpretation:
The type of experiment performed by scientists to discover argon has to be described.
Concept Introduction:
Noble gases are inert gases with completely filled electronic configuration. Helium, neon, argon, xenon, krypton, and radon are the noble gases.
Group 8A in the periodic table contains 8 valence electrons and the outer electronic configuration of noble gases is
Argon is the first discovered noble gas.
Discharge tube is a glass tube fitted with two electrodes placed opposite to each other. The tube is sealed and contains a vacuum pump.
When
(b)
Interpretation:
Reason for taking long time to discover the first noble gas (argon) on Earth should be explained.
Concept Introduction:
Noble gases are inert gases with completely filled electronic configuration. Helium, neon, argon, xenon, krypton, and radon are the noble gases.
Group 8A in the periodic table contains 8 valence electrons and the outer electronic configuration of noble gases is
Argon is the first discovered noble gas.
(c)
Interpretation:
Reason for taking relatively little time to discover the rest of the noble gases after discovering argon should be explained.
Concept Introduction:
Noble gases are inert gases with completely filled electronic configuration. Helium, neon, argon, xenon, krypton, and radon are the noble gases.
Group 8A in the periodic table contains 8 valence electrons and the outer electronic configuration of noble gases is
Argon is the first discovered noble gas.
(d)
Interpretation:
Helium was the last noble gas to be discovered on earth. The reason behind this has to be given.
Concept Introduction:
Noble gases are inert gases with completely filled electronic configuration. Helium, neon, argon, xenon, krypton, and radon are the noble gases.
Group 8A in the periodic table contains 8 valence electrons and the outer electronic configuration of noble gases is
Argon is the first discovered noble gas.
(e)
Interpretation:
There are few known radon compounds, two reasons behind this has to be given.
Concept Introduction:
Noble gases are inert gases with completely filled electronic configuration. Helium, neon, argon, xenon, krypton, and radon are the noble gases.
Group 8A in the periodic table contains 8 valence electrons and the outer electronic configuration of noble gases is
In an exothermic reaction, heat will be liberated.
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