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Thursday, November 18, 2021
How many of the elements exist as gases at 25°c?
H,N,O, flourine (F), Chlorine (Cl),He, Neone (Ne) , Argone (Ar) kriptane (Kr) , Xenone (Xe) these are the elements found in gaseous state at 25℃ present in periodic table.(2) What are the Amphoteric metals ? gives Examples.
(4) What is Mendeleev's periodic table ? give important features and draw back of Mendeleev's table.
(5) What is atomic density ? give the periodicity of atomic density in periods and groups.
(6) What is atomic volume ? and what is periodicity of atomic volume in groups and periods ?
(7) Why there are 2, 8 and 8 elements in first, second and third periodic of periods table respectively ? Explain.
(8) In alkali metal group which is the strongest reducing agent in aqueous solution and why?
(9) The electron affinity of sulphur is greater than oxygen. Why?
(2) What are the Amphoteric metals ? gives Examples.
(4) What is Mendeleev's periodic table ? give important features and draw back of Mendeleev's table.
(5) What is atomic density ? give the periodicity of atomic density in periods and groups.
(6) What is atomic volume ? and what is periodicity of atomic volume in groups and periods ?
(7) Why there are 2, 8 and 8 elements in first, second and third periodic of periods table respectively ? Explain.
(8) In alkali metal group which is the strongest reducing agent in aqueous solution and why?
(9) The electron affinity of sulphur is greater than oxygen. Why?
Topic:
PERIODIC TABLE
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