PART_1 WHAT IS ATOMIC THEORY?Atomic theory;the theory that all matter is made up of tiny indivisible particles (atoms).Atomic theory states that matter is composed of discrete units called atoms, as opposed to the obsolete notion that matter could be divided into any arbitrarily small quantity.Main principles of atomic theory(1) Elements consist of indivisible small particles (atoms).(2) All atoms of the same element are identical; different elements have different types of atom.(3) Atoms can neither be created nor destroyed.What is the first atomic theory?Dalton's atomic theory was the first complete attempt to describe all matter in terms of atoms and their properties.Why is atomic theory important?Atomic theory established that all matter is made of tiny particles, a discovery that led to amazing scientific breakthroughs in areas from modern chemistry to nuclear energy.Why is atomic theory important?Atomic theory established that all matter is made of tiny particles, a discovery that led to amazing scientific breakthroughs in areas from modern chemistry to nuclear energy.