Query Atoms
Any
Default query atom setting. It is also combo button: the other types of atoms can be selected from a sub-menu, after clicking on the black triangle of the lower-right corner of the button.
What kind of query atoms are available in Marvin JS?
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         Query atom symbol  | 
                
         Included Atoms  | 
        
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         Any of the elements except hydrogen  | 
        
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         Hetero atom (any atom except carbon and hydrogen)  | 
        
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         Metal atom  | 
        
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         Halogen atom  | 
        
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         Any of the elements including hydrogen  | 
        
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         Any of the elements except carbon  | 
        
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         Metal atom or hydrogen  | 
        
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         Halogen atom or hydrogen  | 
        
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         Pseudo atom  | 
        
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         Quick access to Atom query properties dialog.  | 
        
    
How to draw a query atom:    
Choose the appropriate query atom type from the combo-box.
The selected atom appears on the tip of the mouse pointer.
You can put it onto the canvas as many times as it is needed.    
To draw a Pseudo atom you should open the Pseudo atom dialog. For more information please, check the Pseudo atom dialog section.