Which of the following statements is/are correct regarding tin and  selenium  An individual selenium atom weighs more than an individual tin atom. A mole of tin weighs more than a mole of selenium  A mole of tin contains more atoms than a mole of selenium   

 How many nanometers are in 558 cm? 

Using the conversion factors below, how many sim would 2.89 haha have?   2 bot  =  3 vid  9 vid  =  1 sim  4 bot  =  6 haha   

Determine if the following statements are True or False.  Elements can never exist naturally in the form of molecules. [1] All compounds are molecules [2] All molecules are compounds [3]   

How many significant figures would the solution to the following problem have?    

Determine if the following statements are True or False.  All compounds are molecules [1] All molecules are compounds [2] Elements can never exist naturally in the form of molecules.  [3]

A researcher looking for new elements found one that she plans to name vanillaium (Va).  The element information to be added to the periodic table is provided below, using this information how many atoms of Va would 134.2  g contain?   

How would the value of 0.00212 mL be represented in scientific notation?  

Determine if the following statements are True or False.  All molecules are compounds [1] Elements can never exist naturally in the form of molecules. [2] All compounds are molecules [3]

1.造句 make a sentence： 凤毛麟角： 胡思乱想： 无微不至： 无师自通： 安然无恙：