How would you justify the presence of 18 elements in the 5 th period of the periodic table?

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Solution

5 shell contain 5s,4d and 5p

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18

5^{t h}

5^{t h}

18

Where would you find the element with atomic number 18 in the periodic table?

Consider the following elements :

$_{20} C a,_{8} O,_{18} A r,_{16} S,_{4} B e,_{2} H e$

Which of the above elements would you expect to be :

(i) very stable? (ii) in group 2 of the periodic table?

(iii) in group 16 of the periodic table ?

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