First question is D, condensation
Second is B, convection
Answer:
The electrons of an atom are typically divided into two categories: valence and core electrons. Valence electrons occupy the outermost shell or highest energy level of an atom while core electrons are those occupying the innermost shell or lowest energy levels
Explanation:
i hope u get it :))
Option d: copper.
Because copper is an element, not a mixture.
It’s used for medicine, muscles nerves
