Answer:
Mars
Explanation:
Mars is the planet with features that are really similar to the earth. As a matter of fact, Mars and the earth are referred to as "twin planets".
Mars and Earth are believed to have historically had even more similar attributes, however, that of mars was lost due to changes in the solar system.
The two planets are mostly similar because of their relatively similar size and proximity to the sun.
C. a nucleus
because they orbit it
Answer:
All of the elements in a period have the same number of atomic orbitals. For example, every element in the top row (the first period) has one orbital for its electrons. All of the elements in the second row (the second period) have two orbitals for their electrons.
Explanation:
