Video Transcript
The image shows a simplified
representation of an atom. What structure is indicated by
X?
An atom is the smallest unit of
ordinary matter that forms a chemical element. There are two main regions in an
atom: the nucleus in the center of the atom and energy levels ordinarily found
outside of the nucleus. The nucleus and energy levels are
where we can find subatomic particles. Subatomic particles are smaller
pieces of matter that make up an atom. The three main subatomic particles
are positively charged protons, neutrally charged neutrons, and negatively charged
electrons. The protons and neutrons are
located in the nucleus, while electrons are located in energy levels.
To answer the question, we need to
identify what structure is indicated by X. X points to a particle in an energy
level. Energy levels only contain
electrons. Therefore, the structure that is
indicated by X is an electron.
