How are Elements Classified in the Periodic Table as per NCERT Solutions?
Elements are classified based on:
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Atomic number (Z) – increasing order
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Electronic configuration
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Grouped into:
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Groups (vertical columns): 18 groups
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Periods (horizontal rows): 7 periods
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Blocks:
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s-block: Groups 1 and 2
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p-block: Groups 13 to 18
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d-block: Transition metals (Groups 3–12)
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f-block: Inner transition metals (lanthanides and actinides)
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This classification reflects similar properties within a group due to similar valence electron configurations.
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