Per NCERT §3.6, elements are classified into FOUR BLOCKS based on what?
AThe atomic mass
BThe number of isotopes
CThe boiling point
DThe type of atomic orbital (s, p, d or f) that is being filled with electrons
Answer & Solution
Correct answer: D. The type of atomic orbital (s, p, d or f) that is being filled with electrons
Per NCERT §3.6, blocks named by the orbital being filled last: s-block, p-block, d-block, f-block.
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