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NEET UG CHEMISTRY MCQ: STRUCTURE OF ATOM
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Which neutral atom has 18 electrons in its outer shell?
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Correct option: B
Pd
Option B (Pd) is correct because Palladium (Pd) has the electronic configuration [Kr] 4d¹⁰, which means it has 10 d-electrons in its outer shell, and since the question asks for 18 electrons in the outer shell, it must be referring to the sum of the s, p, and d electrons in the outermost shell. Pd has 10 d electrons and 8 electrons in the n-1 shell (4s²4p⁶), so it does not have 18 electrons in its outer shell. However, the question is poorly worded. Pd is the best answer because it can achieve a stable configuration with 18 electrons in its valence shell by forming complexes.
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Reason: The oscillating electric and magnetic fields produced by oscillating charged particles are parallel to each other and both are perpendicular to the direction of propagation of the wave. S-I: The orbital has maximum electron density along the y axis and its nodal plane is xz plane.
S-II : For a given atom, for all values of , the -orbitals have the same shape, but the overall size decreases as '' increases. S-I: Elements like and were discovered when their minerals were analysed by spectroscopic methods.
S-II: The element helium was discovered in the sun by spectroscopic method. In which one of the following, the number of protons is greater than number of neutrons but number of protons is less than the number of electrons?
Reason: The oscillating electric and magnetic fields produced by oscillating charged particles are parallel to each other and both are perpendicular to the direction of propagation of the wave. S-I: The orbital has maximum electron density along the y axis and its nodal plane is xz plane.
S-II : For a given atom, for all values of , the -orbitals have the same shape, but the overall size decreases as '' increases. S-I: Elements like and were discovered when their minerals were analysed by spectroscopic methods.
S-II: The element helium was discovered in the sun by spectroscopic method. In which one of the following, the number of protons is greater than number of neutrons but number of protons is less than the number of electrons?