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07/10/2021 4:19 pm
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(a) In the modern periodic table, which are the metals among the first ten elements?
(b) What is the significance of atomic number in the modern classification of elements? Explain with the help of an example.
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07/10/2021 4:21 pm
(a) Lithium, Beryllium are metals.
(b) The real significance of atomic number in the modern periodic classification is that it relates the periodicity in the properties of elements to the periodicity in their electronic configurations.
Example: The atomic number increases from 3 in lithium to 11 in sodium, there is a repetition of electronic configuration from 2, 1 to 2, 8, 1 (both having 1 valence electron).