3a) Atoms make up elements

What are the three main types of tiny particles that make up an atom?

• Protons, neutrons, and electrons

• Quarks, leptons, and bosons

• Molecules, compounds, and mixtures

• Cells, tissues, and organs

How many different kinds of atoms, also known as elements, are currently known?

• 92

• 100

• 118

• 125

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What characteristic determines what kind of element an atom is?

• The number of electrons

• The number of neutrons

• The number of protons

• The size of its nucleus

What is the term for the number of protons in an atom?

• Mass number

• Atomic weight

• Isotope number

• Atomic number

What is the primary role of neutrons within an atom's nucleus?

• To attract electrons

• To provide a positive charge

• To hold the protons together

• To determine the element's reactivity