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What are the three components of an atom?

Protons, electrons, and neutrons.

What charge does a proton have?

Positive charge.

What charge does an electron have?

Negative charge.

What charge does a neutron have?

Neutral charge.

How do models of atoms help in understanding chemical reactions?

They visualize atomic positioning.

How does the mass of a proton compare to a neutron?

They have the same mass.

What does the model indicate about the mass of an electron?

It is much smaller than protons and neutrons.

What distinguishes an open system from a closed system?

Open systems allow mass and heat exchange; closed systems allow only heat.

What is true about the mass of atoms with the same number of protons, neutrons, and electrons?

They have the same mass.

What is an isolated system?

It allows neither heat nor mass exchange.