NEET Chemistry (general) MCQ Question
Which of the following statements about the periodic classification of elements is correct?
The sixth period contains 32 elements and includes 4f and 5d orbitals.
The fifth period begins with rubidium and ends at radon.
The first member of each group in the p-block can only form a maximum of 4 covalent bonds.
The seventh period includes primarily natural elements with stable isotopes.
Correct Answer
Detailed Explanation
The sixth period indeed contains 32 elements with the filling of 6s, 4f, 5d, and 6p orbitals, as per the NCERT context. Statement B is incorrect as the fifth period ends with xenon, not radon. Statement C is misleading since the first member can form more than 4 bonds under certain conditions. Statement D is incorrect because the seventh period contains mostly man-made radioactive elements.
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