Question

atomic number 51 containing element is? S block, d block, p block, f block​

Answer 1

51th element is ANTIMONY(Sb)

Sb is belongs to P Block.

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Answer 2

An element with the atomic number 51 belongs to the p-block.

• Method I

1. The group number of the element can be calculated by:

   $Group\: number = 18 - n$

  Where n is the difference between the atomic number of the higher noble gas and the given atomic number.

  $n = Atomic\: no.\: of\: higher\: noble\: gas - Given\: atomic\: no.$

2. Here, the atomic number of the higher noble gas is 54 (Xenon).

  $n = 54 - 51 = 3$

  $Group\: number = 18 - 3 = 15$

3. Group number 15 belongs to the p-block. It is important to note that this method is not applicable to elements of f-block.

• Method II

1. The group number can also be calculated as:

    $Group\: number = 10 + Electrons\: in\: the\: valence\: shell$

2. The configuration of 51 is: 2, 8, 18, 18, 5

   $Group\: number = 10 + 5 = 15$

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