Hence the size of Cs > Rb.įor (D) Ne > Be : In a periodic table as we move from left to right, the size decreases due to increasing effective nuclear charge. Hence the size of S > Cl.įor (C) Cs > Rb : From top to bottom the size increases due to increase in the shell number. So, the size of V S : In a periodic table as we move from left to right, the size decreases due to increasing effective nuclear charge. Vanadium (V) has an atomic number of 23 while Titanium has an atomic number of 22.

We will now check the options to see which of the options shows the correct sequence of atomic radius.įor (A) V > Ti : Both these elements lie in the d-block and in a d-block the size of elements first increases, then decreases. With increase in shell number the size also increases as we go down the group. The effective nuclear charge increases and hence the size decreases.ĭown the group (from top to bottom) in a periodic table: The shell number increases as we move from top to bottom. Now we will talk about the trends of atomic radius in the periodic table.Īlong a period (from left to right) in a periodic table: The shell number remains the same but the number of electrons increases. First we will see what atomic radius is.Ītomic radius basically refers to the distance between the centre of the nucleus of an atom and its outermost shell or upto the point where the electron density cloud is maximum. In d-block along a period the atomic size first increases then decreases. While from top to bottom the number of shells increases and so the size increases. Hint: In a periodic table as we move from left to right the effective nuclear charge increases and so the size decreases.

Ar atomic radius