Dental Radiography Principles and Techniques - 2 Physics

The fundamental unit of matter is the

• proton

• neutron

• electron

• atom

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NGSS.MS-PS1-1

The nucleus of an atom contains

• protons

• neutrons

• protons and neutrons

• electrons

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NGSS.HS-PS1-8

Which subatomic particle carries a negative electrical charge?

• A neutron

• A proton

• An electron

• A nucleon

Which of the following elements is the simplest atom?

• Hydrogen (H #1)

• Helium (He #2)

• Nitrogen (N #7)

• Oxygen (O #8)

Which of the following statements is true of orbits or shells in the atom?

• Protons travel around the nucleus in well-defined shells.

• An atom contains innumerable shells.

• The energy level within each shell is the same.

• The orbiting shell closest to the nucleus has the highest energy level.

The binding energy or binding force of an electron is

• determined by the distance between the neutrons and protons within the nucleus.

• determined by the distance between the orbiting electrons and the nucleus.

• weaker for electrons located in inner shells than in outer shells.

• determined by the atomic number.

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NGSS.HS-PS2-4

Which of the following statements is true of ionization?

• An atom that gains an electron will have a negative charge.

• An atom that loses an electron will have a negative charge.

• An atom that loses an electron will have a positive charge.

• An atom that gains an electron has a negative charge, and an atom that loses an electron has a positive charge.

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NGSS.HS-PS1-7

An ion pair results when

• a proton is removed from an atom

• an electron is removed from an atom

• a neutron is removed from an atom

• two atoms share a pair of electrons

(1) Radiation is the emission and propagation of energy through space or a substance in the form of waves or particles. (2) Radioactivity can be defined as the process by which certain unstable atoms or elements undergo spontaneous disintegration, or decay, in an effort to attain a more balanced nuclear state.

• Both statements are true

• Both statements are false

• The first statement is true; the second statement is false

• The first statement is false; the second statement is true

Tags

NGSS.HS-PS1-8

The spontaneous emission of radiation from the disintegration of unstable atomic nuclei is

• beta particle decay

• radiation.

• radioactivity

• alpha particle decay

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NGSS.HS-PS1-8