Structure of the Atom — Important Questions
Gujarat Board · Class 9 · Science
45 important questions from Structure of the Atom for Gujarat Board Class 9 Science, with answers. Includes multiple choice and multiple correct questions.
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Important Questions from Structure of the Atom
Which subatomic particles are present in the nucleus of an atom?
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Protons, Neutrons
The nucleus contains protons (positively charged) and neutrons (neutral). Electrons revolve around the nucleus in shells. Alpha particles are not part of atomic structure.
What is the maximum number of electrons that can be accommodated in the K shell?
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2
The K shell (n=1) can hold a maximum of 2 electrons according to the formula 2n². For K shell: 2×1² = 2 electrons.
Which of the following elements have the same number of valence electrons?
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Lithium (Li), Sodium (Na), Potassium (K)
Lithium, Sodium, and Potassium all have 1 electron in their outermost shell, making them have the same valency of 1. Magnesium has 2 valence electrons and Fluorine has 7.
What is the atomic number of an element that has 7 protons in its nucleus?
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7
The atomic number of an element is equal to the number of protons in its nucleus. If there are 7 protons, the atomic number is 7, which corresponds to nitrogen.
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