What is an atom

Atoms are the fundamental building blocks of the universe, composed of a nucleus with protons and neutrons, and surrounded by electrons. The nucleus is positively charged, while electrons are negatively charged, creating an attraction. Most of an atom's mass is in the nucleus, but its size is defined by the electron orbits. Electrons orbit in specific shells with distinct energy levels. The video explores these concepts and the differences in atomic structures across elements.

What is the charge of the nucleus in an atom?

• Negative

• Variable

• Positive

• Neutral

How does the mass of electrons compare to protons and neutrons?

• Electrons are much lighter

• Electrons are slightly lighter

• Electrons have the same mass

• Electrons are heavier

What is the typical size of an atom's radius?

• 10 to the power negative 5 meters

• 10 to the power negative 20 meters

• 10 to the power negative 10 meters

• 10 to the power negative 15 meters

In which shell do electrons have the least energy?

• Innermost shell

• All shells have the same energy

• Outermost shell

• Middle shell

How do electrons orbit the nucleus?

• In random paths

• In specific orbits or shells

• In a straight line

• In a zigzag pattern