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Write down the electronic configuration ...

Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.
`._(1)H, ._(7)N, ._(20)Ca, ._(16)S, ._(4)Be, ._(18)Ar`
Which of these elements belong to the second group ?

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The elements `._(20)Ca` and `._(4)Be` belong to second group as they have two valence electrons.
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TARGET PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS -Answer the following
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  2. Write the name and symbol of the element The most electronegative a...

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  3. The noble gas with the smallest atomic radius.

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  4. Write the name and symbol of the element The most reactive nonmetal...

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  6. An element has its electronic configuration as (2,8,2). Now answer the...

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  7. An element has its electronic configuration as (2,8,2). Now answer the...

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  8. An element has its electronic configuration as (2,8,2). Now answer the...

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  9. What is the difference between electronegativity and electropositivi...

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  10. Consider the elements of period 2 in the modern periodic table. Answer...

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  11. Consider the elements of period 2 in the modern periodic table. Answer...

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  12. Consider the elements of period 2 in the modern periodic table. Answer...

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  13. Write down the electronic configuration of the following elements from...

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