Atomic Theory and Structure

Rutherford made important contributions to atomic theory. What did his model fail to explain?

• location of protons

• why the negatively charged electrons were not pulled into the positively charged nucleus

• location of neutrons

• none of the above

Two or more forms of the same element will have the same number of protons, but different numbers of neutrons. This is referred to as a(n) ______.

• isotope

• mass number

• atomic number

• electron number

Tags

NGSS.HS-PS1-8

What is the structural difference between Nitrogen-14 and Nitrogen-15?

• Nitrogen-14 and Nitrogen-15 have the same number of neutrons

• Nitrogen-14 has 7 protons and 7 neutrons; Nitrogen-15 has 7 protons and 8 neutrons

• Nitrogen-14 has 8 protons and 7 neutrons; Nitrogen-15 has 7 protons and 7 neutrons

• Nitrogen-14 has 7 protons and 8 neutrons; Nitrogen-15 has 7 protons and 8 neutrons

Tags

NGSS.HS-PS1-8

Which of the following statements is true about the element that is represented in the picture?

• The element is an isotope of aluminum, and it has 13 neutrons and 14 protons.

• The element is an isotope of aluminum, and it has 13 protons and 14 neutrons.

• The element is an isotope of cobalt, and it has 13 protons and 14 neutrons.

• The element is an isotope of cobalt, and it has 14 protons and 13 neutrons.

Tags

NGSS.HS-PS1-8

How do you find the mass of a calcium atom?

• add the number of protons and neutrons

• add the number of protons and electrons

• add the number of neutrons and electrons

• add the number of protons, neutrons, and electrons

Which statement describes how electrons fall from the excited state of energy back to the ground state?

• Energy is absorbed

• Energy is released and a photon of light is emitted

• the electron seeks energy

• none of the above

Tags

NGSS.HS-PS1-2

What was Rutherford’s major contribution to atomic theory?

• the arrangement of electrons

• the existence of a small, dense, positively charged nucleus

• The existence of radioactivity in the nucleus

• The discovery of the neutron

Tags

NGSS.HS-PS1-8

__________ conducted the cathode ray tube experiment and discovered the electron.

• JJ Thomson

• Ernest Rutherford

• Niels Bohr

• Democritus

______ discovered the neutron in 1932 and won the Nobel Prize for Physics in 1935.

• Ernest Rutherford

• Niels Bohr

• James Chadwick

• JJ Thomson

Tags

NGSS.HS-PS1-8

In the _________ of the atom, electrons are in the electron cloud and have a probability of being located inside three-dimensional regions around the nucleus referred to as atomic orbitals.

• Rutherford Model

• Quantum Mechanical Model

• Bohr Model

• Plum Pudding Model