An atom is the . A
indestructible part of an element

B
smallest particle of an element that retains the properties of the element

C
smallest portion of any substance that can exist independently

D
least complex particle of all matter the exitence of which can only be inferred philosophically

Inside a flashbulb, oxygen surrounds a thin coil of magnesium. when the flashbulb is set off, a chemical reaction takes place in which magnesium combines with oxygen to form magnesium oxide. which of the chemical equations matches the reaction above? a. mg + o2 mgo2 + energy b. 2mg + o mg2o + energy c. 2mg + o2 2mgo + energy d. mg + o mgo + energy