Structure of the Atom
Gujarat Board · Class 9 · Science
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Quick Quiz: Structure of the Atom
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Who discovered the electron?
What is the charge on an electron?
According to Thomson's model, where are electrons located in an atom?
What did Rutherford's alpha particle scattering experiment prove?
Sample Questions
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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