Answer :
Answer: The decreasing order of atomic size:
For a: Pb > Sn > Ge
For b: Sr > Sn > Te
For c: Na > F > Ne
For d: Mg > Na > Be
Explanation:
Atomic radius of an atom is defined as the total distance from the nucleus to the outermost shell of the atom.
As moving from top to bottom in a group, there is an addition of shell around the nucleus and the outermost shell gets far away from the nucleus and hence, the distance between the nucleus and outermost shell increases. Thus, increasing the atomic radii of the atom.
As moving from left to right in a period, more and more electrons get added up in the same shell and the attraction between the last electron and nucleus increases, which results in the shrinkage of size of an atom. Thus, decreasing the atomic radii of the atom on moving towards right of the periodic table.
For the given options:
- Option a: Ge, Pb, Sn
Germanium (Ge) is present in Group 14 and period 4 of the periodic table.
Lead (Pb) is present in Group 14 and period 6 of the periodic table.
Tin (Sn) is present in Group 14 and period 5 of the periodic table.
So, the decreasing order of atomic size is:
Pb > Sn > Ge
- Option b: Sn, Te, Sr
Tin (Sn) is present in Group 14 and period 5 of the periodic table.
Tellurium (Te) is present in Group 16 and period 5 of the periodic table.
Strontium (Sr) is present in Group 2 and period 5 of the periodic table.
So, the decreasing order of atomic size is:
Sr > Sn > Te
- Option c: F, Ne, Na
Fluorine (F) is present in Group 17 and period 2 of the periodic table.
Neon (Ne) is present in Group 18 and period 2 of the periodic table.
Sodium (Na) is present in Group 1 and period 3 of the periodic table.
So, the decreasing order of atomic size is:
Na > F > Ne
- Option d: Be, Mg, Na
Beryllium (Be) is present in Group 2 and period 2 of the periodic table.
Magnesium (Mg) is present in Group 2 and period 3 of the periodic table.
Sodium (Na) is present in Group 1 and period 3 of the periodic table.
So, the decreasing order of atomic size is:
Mg > Na > Be
The decreasing order of atomic size are the following:
a: Pb > Sn > Ge
b: Sr > Sn > Te
c: Na > F > Ne
d: Mg > Na > Be
Trend of atomic size in periodic table
Atomic radius of an atom is defined as the total distance from the nucleus to the outermost shell of the atom. As move from top to bottom in a group, addition of shell occurs and the atomic radii of the atom increases.
While on the other hand. as we move from left to right, atomic size of an atom decreases due to addition of nuclear charge in the nucleus.
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