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Structure of Atom

Short Answer Type

101.

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

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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.

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

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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.

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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.

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106.

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

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

All atoms of the same element have same number of protons in their nuclei. Therefore, atoms of the same elements have same atomic number. However, atoms of different elements have different atomic numbers because their nuclei have different number of protons. Thus, atomic number of each element has certain characteristic value and no two elements have the same atomic number. Therefore, atomic number of an element is a fundamental property.

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