What best describes orbiting electrons?

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The key idea is that electrons are negatively charged particles that surround the nucleus because the positive charge of protons pulls on them. This attraction keeps electrons in motion around the nucleus, which is why we describe them as orbiting it. That makes the statement about orbiting electrons the best description: they are negatively charged particles traveling around the nucleus. Protons are positively charged and reside in the nucleus; neutrons are neutral particles in the nucleus; and electromagnetic waves are not particles that orbit the nucleus.