We can consider a chemical to be safe if it does not contain any harmful substances such as nitrogen, harmful acids, or even excessive heat. Other chemicals such as the chemicals used in food products like, for example, citric acid, is not so harmful.
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The outermost energy shell of an atom
because they are involved in forming bonds
Answer: a,b
Explanation: because a scientific theory is something that been thought of and tested multiple times.
true because matter is a space not a space
There are many combinations because it is not all about the number of chemicals, but also about the size of the strand. The longer the strand the more combinations there are and more variations and various lengths provide various results.