Determine the number of valence electrons for aluminum.

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.

☆ionisation energy increases across a period from na -> ar☆ionisation energy decreases down a group from li -> fr☆ionic radius decreases across a period from na -> cl☆ionic radius increases down a groupfrom f -> ii hope it clarifies your doubts

Combustion is the act or process of burning. therefore, i believe the answer is  a: burning wood. 

The answer will be c