Which element in row 6 of the periodic table (shown below) has the largest radius?
Cs
Os
Hg
Rn
Answers
Answer:
In 6 th row ,it is starting(left side) with caesium (Cs) and ending with Radon (Rn).
Atomic radius is decreased through the row due to effective nuclear charge . Effective nuclear charge is known as attractive positive charge of nuclear protons acting on Valence electrons.
In here atomic number is increased left to right . Therefore electrons that are in Valence cell also increasing in number ,but number of cells remain in constant. Because there is no change in the row number. Due to this the attraction of Valence electrons and the protons in the nucleus is increased. Then the cells are tended to be close to the nucleus. Thus atomic radius is decreased. So that the element which has lowest atomic number of the row, has the largest radius.
The answer is Cs (atomic number 55) .It has the largest radius among other atoms in 6th row.
Hope this will help you :)
- From the given question the correct option is Cs.
- As we know that Cesium has the largest radius among other atoms in the 6th row. its atomic number is 55.
- Due to effective nuclear charge, atomic radius is decreased.
- As the element which has the lowest atomic number in a raw. so that this element has the largest radius.