Question

Which of the following have similar chemical properties?
A.Isotope
B.Isobars
C.Allotropes
D.Both isotopes and allotropes

Answer 1

Hint:Same chemical properties will be shown by those members who will have the same electronic configuration. Isotopes of a chemical element will have the same atomic number but different mass number i.e. they will vary in neutron no. but will have the same proton no. Since the proton number is the same , that means they will have the same electronic configuration so their chemical properties will be similar.

Complete answer:
Isobars of a chemical element will have the same mass number i.e. they will have the same no. of nucleons but different atomic no. Due to variation in atomic number their electronic configuration will vary which will result in the dis-similarity of chemical properties because chemical properties are similar when there is the same number of valence electrons in the outermost energy level.
Different structural forms of the same element are known as Allotropes. These can exhibit quite different physical properties and can vary in their chemical behaviors. Allotropy is the existence of a chemical element in two or more forms, which may differ in the arrangement of atoms in crystalline solids. Due to change in the structures the allotrope members cannot have the similar chemical properties.
Isotopes are the one which exhibit similar chemical properties because isotopes of a particular element will have the same atomic no. i.e. they will have the same no. of protons but different numbers of neutrons. Since due to similar atomic no. their electronic configurations will be similar which will result in them having the same chemical properties.

So, the correct choice is (A).

Note:
The position of the isotopes for an element is the same in the periodic table as they have the same atomic number. Isotopes of a chemical element simply differ in the number of neutrons due to which there is variation in mass number which is the sum of no. of protons and no. of neutrons. Isotopes can be stable or unstable. Ex- carbon-12, carbon-13, and carbon-14 are three isotopes of carbon with mass numbers 12, 13, and 14, respectively but all of these have the same atomic number which is 6.