3. Read and form the A.P. of the following situation. The elements are arranged in the increasing order of their
Atomic number and the property of an element repeats after 7 elements?
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Step-by-step explanation:
Correct option is
B
reoccur after certain regular interval
When elements are arranged in incresing order of atomic number, elements with similar properties reoccur (due to similar outer electronic configuration) at regular intervals in the periodic table.
Elements coming at intervals of 2,8,8,18,18,32 will have similar properties and thus grouped in one particular group.
Ex : Elements with atomic number 1,3,11,19,37,55,87.
Elements with atomic number 4,12,20,38,56,88 will have similar properties.
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