Each correspond to a principal energy level
Metal rusts when it oxidized around moisture.
Answer:
The largest anthropogenic source of CO in the United States is vehicle emissions.
Explanation:
Answer: Radio waves has the lowest energy and longest wavelength.
Rows of elements are called periods. The period number<span> of an element signifies the highest unexcited energy level for an electron in that element.
</span>Columns of elements help define element groups<span>. </span>Elements within a group share<span> several common properties. Groups are elements have the same outer electron arrangement.</span>
