The size of halogens or the group 17 elements is small.
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Fluorine (F2) is the halogen molecule that is easiest to dissociate because it has the weakest bond strength among the halogens. This is due to its smaller atomic size and higher electronegativity, which results in a weaker bond between the two fluorine atoms.
Examples: sulfur, nitrogen, halogens.
the reactivity of halogens goes on decreasing as we go down the group, because of increasing in atomic size of the respective element.
Yes, all halogens are diatomic molecules in their elemental form, meaning that they exist as pairs of atoms bonded together. Examples of halogens include fluorine (F2), chlorine (Cl2), bromine (Br2), iodine (I2), and astatine (At2).
No, the size of a water molecule remains the same regardless of the phase it is in. The differences in density and spacing between molecules in the different phases make it appear differently but the size of the molecule itself remains constant.