The electronic configuration of Mn can be written as
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Atomic Structure MCQs for NEET — Chemistry Questions with Answers
Practice free Atomic Structure (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
The total number of electrons present in any main energy level can be calculated from
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Explanation
The total number of electrons present in any main energy level (n) can be calculated from the formula 2n^2. This is based on the Aufbau principle, which states that electrons occupy orbitals in the order of increasing energy.
Which of the following statements about quantum numbers is wrong?
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The two electrons have the following sets of quantum numbers . X: 3, 2, -2, + 1/ 2 Y : 3, 0, 0, + 1/2 What is true of the following?
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Explanation
The two sets of quantum numbers X (3, 2, -2, +1/2) and Y (3, 0, 0, +1/2) have different values for the subsidiary quantum number (l) and the magnetic quantum number (m), indicating that they represent electrons with different energy levels and orientations.
If the value of azimuthal quantum number of an electron is 2, then which of the following values of magnetic quantum numbers is not permissible,
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Explanation
The azimuthal quantum number (l) determines the value of the magnetic quantum number (ml) which can range from -l to +l. For l = 2, the possible values of ml are -2, -1, 0, 1, and 2. Therefore, the value of 3 for ml is not permissible.
The fundamental particles which arc responsible for keeping nucleons together is
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Explanation
Mesons are fundamental particles composed of a quark and an antiquark. They are responsible for the strong nuclear force that binds protons and neutrons together in the nucleus, keeping the nucleons together.
The positron is as heavy as
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Explanation
The positron is the antiparticle of the electron, having the same mass as an electron but with a positive charge. It has the same mass as an electron, which is much less than the masses of a neutron, alpha particle, or proton.
Atoms may be regarded as comprising of protons, electrons and neutrons. If the mass attributed to the neutrons were halved and that attributed to electrons were doubled then atomic mass of would
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How many electrons in an atom with atomic number 105 can have (n +l) = 8 ?
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Explanation
The principal quantum number (n) represents the main shell, and the azimuthal quantum number (l) represents the subshell within that main shell. For (n + l) = 8, the possible combinations are: n = 8, l = 0 (s subshell), which can hold 2 electrons, and n = 7, l = 1 (p subshell), which can hold 6 electrons. Together, these can accommodate 2 + 6 = 8 electrons for an atom with atomic number 105.
The size of the nucleus is approximately
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