BPSC – Combined Competitive Examination · প্রশ্ন 63
Which of the following is the first artificially prepared element?
উত্তর দেখান ও ব্যাখ্যা
উত্তর: (B) Tc (Technetium)
ব্যাখ্যা
Technetium (Z = 43) was produced by Perrier and Segrè in 1937; its name means 'artificial'.
- (A) ভুল
Wrong: a naturally occurring element.
- (B) সঠিক
Correct: technetium (1937) was the first element made artificially.
- (C) ভুল
Wrong: a natural radioactive element.
- (D) ভুল
Wrong: a naturally occurring element.