A) \[Na<Mg<Al>Si\]
B) \[Na>Mg>Al>Si\]
C) \[Na<Mg<Al<Si\]
D) \[Na>Al<Mg>Si\]
E) \[Na<Al<Mg<Si\]
Correct Answer: E
Solution :
The energy required to remove an electron completely from the outermost orbit of an isolated gaseous atom is called the ionization potential of the element. Across a period, first ionization potential increases except few atoms of elements. Here it is to be remembered that removal of an electron from a p-orbital is easier than from a completely filled 5-orbital. So, the first ionization potential of Al is less than Mg. So, the correct sequence is: \[Na<Al<Mg<Si\]
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