Which element on the periodic table is the most electronegative? A) Cesium B) Fluorine C) Hydrogen D) Radon

Fluorine is the element with the most electronegativity

Answer: The most electronegative element in the periodic table us Fluorine.

Explanation:

Electronegativity is defined as the property of an element to attract a shared pair of electron towards itself.

Down the group:

The size of an atom increases as we move down the group because a new shell is added and electron gets added up.

As, the size of an element increases, the valence electrons gets away from the nucleus. So, the attraction between the nucleus and the shared pair of electrons decreases

The electronegativity decreases moving from top to bottom down a group

Across a period:

The size of an atom decreases as we move across the period because the electrons get added to the same shell and the nuclear charge keeps on increasing. Thus the electrons get more tightly held by the nucleus.

As, the size of an element decreases, the valence electrons come near to the nucleus. So, the attraction between the nucleus and the shared pair of electrons increases.

For the given elements:

Option A: Cesium is present in Group 1 and Period 6 of the periodic table.

Option B: Fluorine is present in Group 17 and Period 2 of the periodic table.

Option C: Hydrogen is present in Group 1 and Period 1 of the periodic table.

Option D: Radon is present in Group 18 and Period 6 of the periodic table.

Hence, the most electronegative element in the periodic table us Fluorine.