State the approximate radius of an atom as 1×10−10 metres.
Describe the basic structure of an atom, consisting of a positively charged nucleus (containing protons and neutrons) surrounded by negatively charged electrons.
Understand that the nucleus is less than 1/10,000 of the radius of an atom, yet it contains almost all of the atom's mass.
Explain how electrons are arranged in different energy levels at varying distances from the nucleus.
Describe how electron arrangements can change; they move to a higher energy level (further from the nucleus) by absorbing electromagnetic radiation, or to a lower energy level (closer to the nucleus) by emitting electromagnetic radiation.
Recognize and interpret scientific expressions given in standard form.
