Practice Test - Atoms

The Greek philosopher Democritus coined what word for a tiny piece of matter that cannot be divided?

• Element
• Atom
• Electron
• Molecule

Which of the following is NOT part of John Dalton’s atomic theory?

• All elements are composed of atoms
• All atoms of the same element have the same mass.
• Atoms contain subatomic particles
• A compound contains atoms of more than one element.

Which of the following is unique for any given element?

• the number of neutrons
• the charge on the electrons
• the number of protons
• the mass of a neutron

Which of the following most accurately represents John Dalton’s model of the atom?

• a tiny, solid sphere with an unpredictable mass for a given element
• a hollow sphere with a dense nucleus
• a tiny, solid sphere with a predictable mass for a given element
• a sphere that is hollow throughout

J. J. Thomson’s experiments provided evidence that an atom

• is the smallest particle of matter
• contains negatively charged particles.
• has a negative charge
• has a positive charge.

Rutherford’s gold foil experiment provided evidence for which of the following statements?

• Negative and positive charges are spread evenly throughout an atom.
• Alpha particles have a positive charge.
• Gold is not as dense as previously thought.
• There is a dense, positively charged mass in the center of an atom.

Tags

NGSS.HS-PS1-8

Who provided evidence for the existence of a nucleus in an atom?

• John Dolton
• J.J. Thomson
• Democritus
• Ernest Rutherford

Tags

NGSS.HS-PS1-8

Which subatomic particle has a negative charge?

• Electron
• Alpha Particle
• Neutron
• Proton

Which statement about subatomic particles is NOT true?

• Protons and neutrons have almost the same mass.
• Protons and electrons have opposite charges.
• Unlike protons and electrons, neutrons have no charge.
• Protons and neutrons have the same charge.

The number of protons in one atom of an element is that element’s

• mass number.
• balanced charge.
• atomic number.
• isotope.