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A $$1s^22s^22p^63s^23p^63d^54s^2$$ B $$1s^22s^22p^63s^23p^63d^54s^24p^6$$ C $$1s^22s^22p^63s^23p^63d^64s^2$$ D $$1s^22s^22p^63s^23p^63d^74s^2$$
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Correct option is A. $$1s^22s^22p^63s^23p^63d^54s^2$$
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The modern periodic table consists of 7 periods and 18 groups. Each period begins with the filling of a new energy shell. In accordance with the Aufbau principle, the seven periods (1 to 7 ) have 2, 8, 8, 18, 18, 32, and 32 elements respectively.
The seventh period is still incomplete. To avoid the periodic table being too long , the two series of f-block elements, called lanthanoids and actionoids are placed at the bottom of the main body of hte periodic table
The element with atomic number 57 belongs to
(a) s- block ( b) p-block (c) d- block (d) f- block
(a) 7s27p6 (b) 5f146d107s27p0
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(a) 107 (b) 118 (c) 126 (d) 102
(a) 1s22s22p63s23p63d54s2
(b) 1s22s22p63s23p63d54s34p6
(c) 1s22s22p63s23p63d64s2
(d) 1s22s22p63s23p63d74s2
(a) noble gases (b) halogens (c) heavy metals (d) light metals
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