Exploring Atomic Theory and Structure

What is the smallest unit of an element that retains the properties of that element?

• Atom

• Proton

• Molecule

• Compound

Which of the following is a pure substance that cannot be broken down into anything simpler?

• Mixture

• Compound

• Solution

• Element

Who was the philosopher that first coined the term 'atom'?

• Aristotle

• Plato

• Democritus

• Socrates

What is the charge of a proton?

• Neutral

• Positive

• Negative

• Variable

Which subatomic particle is neutral and found in the nucleus?

• Neutron

• Electron

• Quark

• Proton

What does the number of protons in an atom determine?

• Its volume

• Its identity

• Its charge

• Its mass

Where is the majority of an atom's mass located?

• Outer shell

• Valence electrons

• Nucleus

• Electron cloud

What is the space surrounding the nucleus filled with?

• Electrons

• Quarks

• Neutrons

• Protons

What force holds the nucleus together despite the repulsion between protons?

• Strong nuclear force

• Electromagnetic force

• Gravitational force

• Weak nuclear force

What makes a nucleus unstable and radioactive?

• Too many electrons

• Too few neutrons

• Electromagnetic repulsion exceeding strong nuclear force

• Lack of quarks

Tags

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