Which of the following elements has the largest atomic radius? silicon aluminum sulfur phosphorous

Aluminum has the largest atomic radius.

Explanation:

Atomic radius of an atom is defined as the total distance from the nucleus to the valence shell that is outermost shell of the atom.

1) When we move down the group, due to an addition of shell the outermost shell moves far away from the nucleus the distance between the nucleus and outermost shell increases.

Thus, the atomic radii of the atom increases down the group.

2) when we move from left to right in a period number of electrons increases in the same shell along with increase in number of protons. With this increase in protons effective nuclear charge between the valence electrons and nucleus increases, which results in the contraction of size of an atom.

Thus, atomic radii of an atom decreases on moving towards right of the periodic table.

Since,silicon ,aluminum ,sulfur and phosphorous are of same period. the order of these elements in periodic table is Aluminum, silicon, phosphorus and sulfur.

As we know that atomic size decreases from left to right .So, the the element with highest atomic radius is aluminum and then silicon followed by phosphorus and sulfur.

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