Hypothesis - I predict that the orchids will grow best with a medium concentration of fertilizer
        
             
        
        
        
The options 
Select one:
a. a 3- ion forms.
b. the noble gas configuration of argon is achieved.
c. the result is a configuration of 1s2 2s2 2p6.
d. the atom gains five electrons.
Answer:
c. the result is a configuration of 1s2 2s2 2p6.
Explanation:
Aluminium atom has atomic number of 13 , hence the number of electron is 13 for a neutral atom of aluminium. When aluminium atom reacts with other elements it usually gives out three electron to attain the octet configuration. 
The cation representation of aluminium is Al3+ because it has loss three electron to attain the octet rule. Aluminium will be left with 10 electrons after losing 3 of it electrons. The electronic configuration will be represented as follows after losing three electrons; 
1S² 2S² 2P∧6 . 
At this stage the octet rule has been achieved as it will be represented as 
 2  8.  The first energy shell now contains two electron and the second energy shell contains 8 electrons. 
The configuration of  Neon has been formed in the process.
 
        
             
        
        
        
There would be 55.8 g present
        
                    
             
        
        
        
Answer:
Explanation:
Use your other senses such as touch or smell, does it react in different temperatures, is it then visible under a microscope, does it react with different elements or gases?   Think outside the box.
 
        
                    
             
        
        
        
Well if the change is reversible then it is a physical change, but if not then it is a chemical change.