Answer:
A radical is a group of atoms behaving as a unit in a number of compounds where as an element is a species of atoms having the same number of protons in their atomic nuclei. 
Explanation:
 
        
                    
             
        
        
        
Answer:
Hey mate.....
Explanation:
This is ur answer.....
<em>Volcanoes are closely associated with plate tectonic activity. Most volcanoes, such as those of Japan and Iceland, occur on the margins of the enormous solid rocky plates that make up Earth's </em><em>surface.</em>
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Answer:
h2+O ---> H2O
reactants: H2 & O
products: H2O
Explanation:
The simple reaction that produces a water molecule from H2 and O would be the one written above, even though there are 2 hydrogen molecules, they will form an H2 molecule rather than 2 individual H molecules (almost never seen) the reactants would be your hydrogen and oxygen molecules individually before they bond to form a molecule of water (H2O) which is the product 
 
        
             
        
        
        
First gap is BY USING MAGNETS 
2nd is ELECTROLYSIS 
3rd is EVAPORATION