A humidifier putting moisture in the air IS a physical change.
swift to hear, slow to speak
Explanation:
Crude oil, commonly known aspetroleum<span>, is a liquid </span>found<span> within the Earth comprised of hydrocarbons, organic compounds and small amounts of metal. Hope this helps</span>
-1
An ion is an atom which has gained or lost electrons.
Atoms want to have full outer shells of electrons.
Electrons are negative.
Fluorine has 7 electrons in its outer shell. When it gains one to fill its shell it will be made negative.
Thus the charge of a fluorine ion is -1
B. Is the answer Step Bye Step Explanation: