Answer :
Answer: Given elements are arranged in decreasing order of atomic radius as follows.
Pb > Al > Cl > F
Explanation:
Atomic radius is defined as the distance between the nucleus of an atom and its valence shell. More is the distance more will be the atomic size of atom.
When we move down a group then there occurs an increase in atomic radius of the elements but when we move across a period then there occurs a period then there occurs a decrease in atomic radii of the elements.
Both fluorine and chlorine are group 17 elements. Aluminium is a group 13 element and lead is a group 14 element.
Therefore, given elements are arranged in decreasing order of atomic radius as follows.
Pb > Al > Cl > F
The elements when they are arranged in decreasing order of atomic radius will be Pb > Al > Cl > F
Atomic radius refers to the distance that's between the nucleus of an atom and the valence shell of the atom.
It should be noted that in the periodic table, when we move down a group, there is an increase in the atomic radius of the elements.
On the there hand, when we move across a period, there is a reduction in the atomic radii of the elements. Aluminium is a group 13 element, lead is a group 14 element, while fluorine and chlorine are group 17 elements.
In conclusion, the order of atomic radius will be Pb > Al > Cl > F
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