These are aluminum atoms. An atom is the smallest particle of an element that has the properties of that element. Some properties of aluminum are: shiny, silver colored, fragile, and thin. Each element has its own type of properties. Chemists use symbols to represent elements.
1 A person who has passed away and who is no longer alive is someone who would be described as dead.  When your career has faltered, you've been fired and have no hope of gaining your position back, this is an example of a time when your career is dead.
remains - the dead body of a human being; the cadaver was intended for dissection; the end of the police search was the discovery of a corpse; the murderer confessed that he threw the stiff in the river; honor comes to bless the turf that wraps their clay. cadaver, corpse, stiff, clay.