All the statements are correct with respect the two atoms placement on the Periodic Table EXCEPT –

C because both shells of the atom are filled therefore it is stable and isn't reactive. It's not A because there is only one electron in the outer shell therefore it is reactive but not highly reactive. So C is the answer.

Hope this helps! Brainliest is always appreciated!

The name of the instrument that the scientist uses is called a microscope.a microscope is used to view objects which is not visible to the naked eyes