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.
Definition of 'the living dead'. the living dead in British. occultism. dead people that have been brought back to life by a supernatural force. While a mad scientist undertakes experiments to control the living dead, his military minders are beginning to get trigger-happy. living dead Collins English Dictionary.