Unit 1 Review

A group of students created a series of flashcards related to atomic structure. They are debating what information would be best to include. Which of the following statements are true for the NUCLEUS of an atom? Select THREE correct answers.

• location of the protons and electrons

• locations of the electrons and neutrons

• most of the mass of an atom is found here

• location of the protons and neutrons

• has a positive charge

Tags

NGSS.HS-PS1-8

Refer to the diagram of the atom. Structures A and B are located in the

• valance shell

• electron cloud

• energy level

• nucleus

Tags

NGSS.MS-PS1-1

Which of the following statements are true about Thomson's discovery of electron properties? Select TWO correct answers.

• A. His experiment showed all atoms have negatively charged particles.

• B. He used gold foil to prove electrons are positive.

• C. The mass of the proton was measured as part of his experiment.

• D. His experiment focused only on neutrons and neutrinos.

• E. He used a plum pudding model to demonstrate the structure of an atom.

Which model of the atom was used as a result of JJ Thomson's cathode ray experiments?

• Plum pudding model

• Nuclear model

• Planetary model

• Quantum mechanical model

Which model was developed after alpha particles were bombarded onto sheets of gold?

• Rutherford Model

• Planck Model

• Bohr Model

• Quantum Model

In the 1800s, John Dalton proposed a model of the atom. His model depicted the atom as a solid sphere. Scientific models of the atom have changed many times since this model was proposed. What is the best explanation for the changes to Dalton's model?

• Modern society demands accuracy in science.

• Computer-generated art increases scientists' ability to draw models.

• Scientists are able to modify earlier ideas as more information is discovered.

• Scientists today are more open to changing ideas than in the past.

In his famous experiment, Ernest Rutherford bombarded thin gold foil with high-speed, positively charged alpha particles. Most passed through, but a few deflected sharply. Which conclusion best explains the internal structure of the atom based on this experiment?

• The atom reflects alpha particles because electrons repel them from random areas in the electron cloud.

• The atom is a solid mass with positive charges spread evenly, so alpha particles bounce off the surface.

• The atom deflects alpha particles because neutrons inside the atom repel them with a strong neutral force.

• The atom has a dense center where most mass is located, but the rest of the atom is mostly empty space.

Select the circle that represents the half-life point of Americium-242. Refer to the graph titled 'Beta Decay of Americium-242' showing the mass of Am-242 remaining (micrograms) over time (hours).

• Circle at 12 hours

• Circle at 16 hours

• Circle at 36 hours

• Circle at 48 hours

Tags

NGSS.HS-PS1-8

• 226/88

• 230/88

• 228/84

• 226/85

Tags

NGSS.HS-PS1-8

Which of the following equations represents alpha decay?

Tags

NGSS.HS-PS1-8