- A84
- B85
- C83
- D82
Explanation:
The number of protons found in the nucleus of an atom of a given element is called atomic number. Elements are placed in periodic table according to their atomic number. Atomic number increases from left to right and top to bottom of periodic table. Higher the atomic number, heavier is the atom.
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Statement $I$ : The boiling point of three isomeric pentanes follows the order
n-pentane $>$ isopentane $>$ neopentane
Statement $II$ : When branching increases, the molecule attains a shape of sphere. This results in smaller surface area for contact, due to which the intermolecular forces between the spherical molecules are weak, thereby lowering the boiling point.
In the light of the above statements, choose the most appropriate answer from the options given below:
$'B'$ is