BPSC – Combined Competitive Examination · வினா 63
Which of the following is the first artificially prepared element?
விடையைக் காட்டு & விளக்கம்
விடை: (B) Tc (Technetium)
விளக்கம்
Technetium (Z = 43) was produced by Perrier and Segrè in 1937; its name means 'artificial'.
- (A) தவறு
Wrong: a naturally occurring element.
- (B) சரி
Correct: technetium (1937) was the first element made artificially.
- (C) தவறு
Wrong: a natural radioactive element.
- (D) தவறு
Wrong: a naturally occurring element.