Question

21.
Electronic configuration of four elements are given in the table. Arrange
these elements in the increasing order of their electronegativity. Give
reason.
Elements
Electronic configuration
Na
2, 8, 1
S
2, 8, 6
Al
2, 8, 3
K
2, 8, 8, 1​

Answer 1

$\huge\boxed{\underline{\mathcal{\red{A} \purple{N} \blue{S} \pink{W} \orange{E} \green{R}}}}$

ascending order of increasing electronegativity:-

K < Na < Al < S

• moving from left to right in a periodic table, electronegativity increases. Since, S lies in the extreme right, it is the most electronegative
• Aluminium comes in middle so it is lesser electronegative than S
• Na is in extreme left so, it is even less electronegative than Al.
• moving from top to bottom in a periodic table electronegativity decreases. K lies below Sodium, so it is the least electronegative element.

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