68

68.  Element with atomic number 58 belongs to which group and block of periodic table respectively


(1)  3rd, d-block                                                 (2)  3rd, f-block
(3)  4th, f-block                                                  (4)  6th, d-block

Dear student,
According to periodic table Lanthanum (La) which is a d-block element has atomic number 57. After this the electron starts filling in the "f" subshell. All the f-block elements are present in IIIB group or 3rd group.
Hence the answer is (2)

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Group- Lanthnaides
Block- F
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Lanthnaides are 3rd group
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