Match the atoms which might substitute for one another. Match the items in the left column to the items in the right column.

1. Si A. Na

2. K B. V

3. Nb C. C

4. Cu D. Ag

5. P E. Ca

6. Mg F. As

If you want to answer this question, all you have to do is take a look at the periodic table. An element might substitute for another element if it is from the same family/column on the periodic table.

So, these are the atoms which might substitute for one another:

1. Si = C. C

2. K = A. Na

3. Nb = B. V

4. Cu = D. Ag

5. P = F. As

6. Mg = E. Ca