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प्रश्न
What is the main characteristic of the last element in each period of the periodic table?
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उत्तर
The last element in each period of the periodic table is a gaseous element with its valence shell completely filled. Except for helium, which has a complete duplet configuration, all five gases have a complete octet configuration.
संबंधित प्रश्न
Name the scientist who prepared modern periodic table.
Which of the following statement is correct in regard to the classification of elements?
(a) Elements in modern periodic table are arranged on the basis of increasing atomic masses.
(b) Elements in Mendeleev's periodic table are arranged on the basis of increasing atomic numbers.
(c) In modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass.
(d) In modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.
Name two elements in halogens.
What is meant in the periodic table by a period?
Give the symbol and valency of the following element and radical.
Chlorine [Chloride]
Give the chemical formula of magnesium nitrate
Find the odd one out and give its explanation.
Distinguish between:
s-block - p-block
______ is the longest period in the periodical table.
Match the atomic number with the following:
A rare gas.
