The elements with atomic numbers 3, 11, 19, 37 and 55 belong to :

alkali metals

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alkaline earth metals

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halogens

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noble gases

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Solution

The correct option is A alkali metals
The atomic number of elements are 3, 11, 19, 37, 55.
The electronic configuration of elements will be
3 $=$ 2, 1
11 $=$ 2, 8, 1
19 $=$ 2, 8, 8, 1
37 $=$ 2, 8, 8, 18, 1
55 $=$ 2, 8, 8, 18, 18, 1
The pattern shows that all elements have 1 electron in their outermost valence shell and all these elements belong to alkali metals.

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Similar questions

	Column $I$		Column $I I$
$P$	$11$	$1$	IE is maximum among the given elements
$Q$	$19$	$2$	Alkali metal
$R$	$37$	$3$	Largest size among the given elements
$S$	$55$	$4$	Position next to $K r$

^{'} X^{'},^{'} Y^{'}

^{'} Z^{'}

19, 37

55

19, 37

55

The element with atomic number 55 belongs to which of the blocks in the periodic table-

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