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Question: The diameter of a proton is about 1 × 10 - 12 mm. Write this number in standard form.


A ) 0.00000000001
B ) 0.0000000001
C ) 0.0000000000001
D ) 0.000000000001

Steps to derive

1 1 x 10 -12 = 0.000000000001
 [Multiplying by 0.000000000001 moves the decimal point 12 places to the left.]

2 The diameter of a proton expressed in standard form is 0.000000000001 mm.



Hence the right answer is Option D

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