Some Important Elements MCQs with Answers

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Cadmium is not a radioactive element; it is a stable, naturally occurring heavy metal.

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Silicon is the most commonly used semiconductor material in electronic devices.

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Cerium (Ce) is a lanthanide element, belonging to the f-block inner transition metals of the periodic table.

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The atomic weight of Mercury (Hg) is 200.59 u.

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The element X cannot be Sc (Scandium) because it has only 3 valence electrons and cannot form XF₄.

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Aluminum shows a +3 oxidation state because it loses its three valence electrons to achieve a stable electronic configuration.

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Fe²⁺ has the maximum number of unpaired electrons (4 unpaired electrons in its 3d⁶ configuration).

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The atomic sign (chemical symbol) of potassium is K.

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U-235 is the isotope of uranium that undergoes fission readily when bombarded with slow neutrons.

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Radium gives off alpha rays as part of its natural radioactive decay process.