3) 2) 1) i think this is the right answer but c looks correct too\
Hi Ace22704,
Answer - natural observation
I think this experimental method is a better option because its in a natural environment where the kids dont know whats happening unlike the suveys where you ask them questions which is probably a bad idea because they might feel scared and just change their minds.
The term coordinate number in ionic crystals refers to the number of oppositely charged ions surrounding a particular ion, I hope this was able to help you.
