Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

Structure of Atom

Short Answer Type

101.

Give the number of electrons in the species $straight H subscript 2 superscript plus comma space space straight H subscript 2 space and space straight O subscript 2 superscript plus.$

135 Views

102.

Write the complete symbol for the atom with the given atomic number (Z) and atomic number (A).
(i) Z = 17, A = 35
(ii) Z = 92, A = 233
(iii) Z = 4, A = 9.

217 Views

103. An element with mass number 81 contains 31.7% more neutrons as compared to protons. Assign the atomic symbol.

172 Views

104. An ion with mass number 37 possesses one unit of negative charge. If the ion contains 11.1 % more neutrons than the electrons, find the symbol of the ion.

145 Views

105. An ion with mass number 56 contains 3 units of positive charge and 30.4% more neutrons than electrons. Assign the symbol to this ion.

151 Views

106.

What is the atomic number and mass number of A³⁺ion with 21 electrons and 25 neutrons?

154 Views

107. Explain that atomic number is the fundamental property of an element.

351 Views

108.
Define isotopes, isobars and isotones.

Isotopes: Isotopes are atoms of the same element having same atomic number but different mass numbers. e.g.

Isobars: Isobars are atoms of different elements having different atomic numbers but the same mass number. e.g. are isobars of each other.

Isotones: Isotones are atoms of different elements having same number of neutrons. For example