1
Question
Read the given statements carefully.
(a) There are total of 7 columns in the Modern periodic table.
(b) Mendeleev arranged the elements in the increasing order of their atomic numbers and according to their chemical properties
(c) Newlands’ law of Octaves worked well with lighter elements only.
The correct statement(s) is/are
Read the given statements carefully.
(a) There are total of 7 columns in the Modern periodic table.
(b) Mendeleev arranged the elements in the increasing order of their atomic numbers and according to their chemical properties
(c) Newlands’ law of Octaves worked well with lighter elements only.
The correct statement(s) is/are
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Solution
The correct option is B Only (c)
The Modern periodic table has 18 vertical columns known as ‘groups’ and 7 horizontal rows known as ‘periods’.
Mendeléev arranged the elements in the order of their increasing atomic masses and also on the basis of similarity of chemical properties.
Newlands’ Law of Octaves was applicable only upto calcium, as after calcium, every eighth element did not possess properties similar to that of the first. Hence, it worked well with lighter elements only.
Hence, the correct answer is option (b).
The Modern periodic table has 18 vertical columns known as ‘groups’ and 7 horizontal rows known as ‘periods’.
Mendeléev arranged the elements in the order of their increasing atomic masses and also on the basis of similarity of chemical properties.
Newlands’ Law of Octaves was applicable only upto calcium, as after calcium, every eighth element did not possess properties similar to that of the first. Hence, it worked well with lighter elements only.
Hence, the correct answer is option (b).
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