Differences between natural element and built element?

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The discussion centers on the differences between natural and built elements, highlighting that man-made elements tend to be more expensive and have higher atomic numbers and weights. Additionally, there is a mention of radioactivity as a characteristic of some built elements. Participants express interest in the topic while emphasizing the need for individual effort in research. The conversation also touches on the limitations of providing direct answers to homework questions. Overall, the distinctions between natural and built elements are framed around cost, composition, and safety concerns.
satrohraj
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at least 10..

Thank You
 
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Whatever, . . .
But i think the question is kinda interesting.

Here is my analysis..

1) Man made elements are very costly.
2) They are higher in atomic number and weight.
3) They are radio-active.
4) They are .. ?

Anything else?
 
Thread 'Confusion regarding a chemical kinetics problem'

Thread 'Confusion regarding a chemical kinetics problem'

TL;DR Summary: cannot find out error in solution proposed. [![question with rate laws][1]][1] Now the rate law for the reaction (i.e reaction rate) can be written as: $$ R= k[N_2O_5] $$ my main question is, WHAT is this reaction equal to? what I mean here is, whether $$k[N_2O_5]= -d[N_2O_5]/dt$$ or is it $$k[N_2O_5]= -1/2 \frac{d}{dt} [N_2O_5] $$ ? The latter seems to be more apt, as the reaction rate must be -1/2 (disappearance rate of N2O5), which adheres to the stoichiometry of the...
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