Electronegativity values increase from left to right across a period in the peri

Question

Electronegativity values increase from left to right across a period in the periodic table because there is an increase in the____________ charge of the nuclei in this direction.

2. These values also increase from the bottom to the top of a group because the size of the atom decreases, resulting in a _______________ distance between the nucleus and the valence electron shell, which increases the attraction between the protons and electrons.

3. When considering both carbon and oxygen,__________________ is more electronegative because it appears further to the right in the same period of the periodic table.

4. When considering chlorine and iodine,_______________________ is more electronegative because it appears higher in the same group of the periodic table.

Explanation / Answer

1. Electronegativity values increase from left to right across a period in the periodic table because there is an increase in the effective nuclear charge of the nuclei in this direction.

Explanation: The effect of increase in effective nuclear charge is that it can attract bonding electron pairs more strongly.

And electronegativity is tendancy of an element to pull shared pair of bonded electrons towards itself.

2. These values also increase from the bottom to the top of a group because the size of the atom decreases, resulting in a lesser distance between the nucleus and the valence electron shell, which increases the attraction between the protons and electrons.

Explanation: Again, the distance between nucleus and valence electrons is less so the nucleus can attract the bonding electrons easily

3. When considering both carbon and oxygen, oxygen is more electronegative because it appears further to the right in the same period of the periodic table.

Explanation: oxygen has more effective nuclear charge as compared to carbon

4. When considering chlorine and iodine, chlorine is more electronegative because it appears higher in the same group of the periodic table.

Explanation: chlorine has more effective nuclear charge as compared to iodine.

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