Hydrogen has three isotopes 1H, 2H, and 3H. What is the difference between these three isotopes? The number of protons ranges from 1 to 3.
The number of electrons ranges from 1 to 3.
The number of neutrons ranges from 0 to 2.
The number of protons ranges from 0 to 2.

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In the following table, all the columns for the element calcium are filled out correctly. element electron structure of atom electron structure of ion net ionic charge calcium 1s22s22p63s23p64s2 1s32s22p63s23p64s1 +1 true false

How does a catalyst increase the speed of a reaction? a. the catalyst eliminates the activated complex stage, allowing products to form immediately. b. the catalyst lowers the energy level of the reactants, making it easier for them to react. c. the catalyst makes it easier for the activated complex to form, lowering the activation energy. d. the catalyst raises the energy level of the products, making the reaction finish sooner. reset next

Why is it that 85.48 rounded to two significant figures is 85 and not 86?