In each of the following pairs, choose the atom having the bigger size :

(a) Mg (Atomic number = 12) or Cl (Atomic number = 17)

(b) Na (Atomic number = 11) or K (Atomic number = 19)

Open in App

Solution

(a) Mg has a bigger size than Cl because the atomic size decreases on moving from left to right in a period of the periodic table. Mg and Cl belong to period 3 of the periodic table.

(b) K has a bigger size than Na because the atomic size increases on going down in a group of the periodic table. Na and K belong to group 1 of the periodic table.

Suggest Corrections

Similar questions

In each of the following pairs, choose the atom having the bigger size :

(a) Mg (At. No. 12) or Cl (At. No. 17)

(b) Na (At. No. 11) or K (At. No. 19)

(a) The atomic number of sodium is 11. What is the number of electrons in $N a^{+}$ ?
(b) the atomic number of chlorine is 17. What is the number of electrons in $C l^{-}$ ?

Q. Which one of the following set of ions represents the collection of isoelectronic species?
[Atomic numbers: F = 9; Cl = 17; Na = 11; Mg = 12; Al = 13; K = 19; Ca = 20; Sc = 21]

Q. An element is represented by

_{Z} X^{A}

, where Z is atomic number which is also equal to number of proton, A is mass number and X is symbol of the element.
Mass number (A) = Number of protons (Z) + Number of neutrons.
Isoelectronic: Species/ elements having same number of electron
Isodiaphers: Elements having same value of

| (A - 2 Z) |

Isotopes: Atoms having same number of proton

Which of the following pairs of compounds is both isoelectronic and isotopic?

Q. The formula of the product formed when the element A (atomic number 19) combines with the element B (atomic number 17), is:

Join BYJU'S Learning Program

In each of the following pairs, choose the atom having the bigger size : (a) Mg (Atomic number = 12) or Cl (Atomic number = 17) (b) Na (Atomic number = 11) or K (Atomic number = 19)

In each of the following pairs, choose the atom having the bigger size :

(a) Mg (Atomic number = 12) or Cl (Atomic number = 17)

(b) Na (Atomic number = 11) or K (Atomic number = 19)