There are 7 valence electrons in the atom :)
Answer:
Mercury
Explanation:
While it is true that most metals are solid at room temperature, mercury is liquid at room temperature hence mercury is often designated as the 'liquid metal'.
Thus, if i find a bottle on the shelf that has no solid in it, only liquid and i know that only pure metals are stored in that area of the laboratory, then i will quickly relabel it as mercury.
Isotones are nuclides that have the same neutron number but a different proton number. Therefore the answer is C. boron and carbon.
Iron is a type of element because iron is metal and metal is also a mineral
Hoped this helped