Amethane molecule contains 1 atom of carbon. the number 1 represents how many significant figures? a methane molecule contains 1 atom of carbon. the number 1 represents how many significant figures? one two three infinite

Option A: one.

In a number, to determine the number of significant figures following 3 rules are used:  

(1) The digits which are non-zero are always significant.

(2) Any zeros between two digits which are non-zero are significant.

(3) In the decimal portion, trailing zeros are significant.  

The number is 1 carbon atom, it has one non-zero digit.

Therefore, according to rules, there is only 1 significant figure (underlined): 1.

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nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.