D. In columns 3-12 in the centre of the table
Answer:
B. what happens when iron rusts in the presence of water
Explanation:
Chemistry is a branch of science involving the composition and changes of matter. In other words, a chemist, who is a trained specialist in the science of chemistry, seeks to answer questions related to properties of matter.
In this question, a chemist is most likely to study "what happens when iron rusts in the presence of water" because it involves a change in the chemical properties of a substance (iron) i.e. a chemical change. However, what happens when ice melts to liquid water is a physical change.
Potassium, K ( r = 280 pm)
Calcium, Ca (r = 231 pm)
Florine, F (r = 147 pm)
Silicon, Si (r = 111 pm)
Nitrogen, N (r = 65 pm)
