When a metal atom gains electrons it forms an anion. Always true
Sometimes true
Never true

Always true explaing When electrons are gained by a neutral atom, an ion with a negative charge is formed. A negatively charged ion is called an anion. An atom that gains one extra electron forms an anion with a 1- charge. An anion is named by taking the root name of the atom and changing the ending. (Ex: Chloride

Ibelieve the answer 4 moles

Answerstudying coal cumbustion as an energy source;