Which of the following is true regarding actinides?....

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Which of the following is true regarding actinides?
(1) Monazite is the chief ore of thorium.
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(2) None of the elements heavier than uranium
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occurs in nature.
(3) The electronic configuration of uranium is \( [\mathrm{Rn}] 5 \mathrm{f}^{3} 6 \mathrm{~d}^{1} 7 \mathrm{~s}^{2} \).
(4) Some of these are radioactive elements.


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