Atomic Theory and Isotopes

What is the atomic structure of an atom?

• The atomic structure of an atom consists of a nucleus containing protons and neutrons, surrounded by electrons in energy levels or shells.

• The atomic structure of an atom consists of a nucleus containing electrons and neutrons, surrounded by protons in energy levels or shells.

• The atomic structure of an atom consists of a nucleus containing neutrons and electrons, surrounded by protons in energy levels or shells.

• The atomic structure of an atom consists of a nucleus containing electrons and protons, surrounded by neutrons in energy levels or shells.

What is the charge of an electron?

• +1

• -1

• 0

What are any of the various self-contained units of matter or energy that are fundamental parts of all matter. These particles include electrons, protons, and neutrons.

• subatomic particles

• elements

• nucleus

• electron cloud

What is the mass number?

• the number of protons in the nucleus

• the number of protons and neutrons in the nucleus

• the number of neutrons in the nucleus

• the number of protons and electrons in the atom

How many electrons does a neutral fluorine atom have?

• 5

• 7

• 9

• 11

Which phrase describes two atoms that are isotopes

• Same mass number, same atomic number
• Same mass number, different atomic number
• Different mass number, same atomic number
• Different mass number, different atomic number

Most of the mass in an atom is made up of _____________________?

• protons and electrons
• protons and neutrons
• neutrons and electrons
• electrons and quarks

What scientist is best known for his gold foil experiment?

• J.J. Tomson
• Ernest Rutherford
• John Dalton
• Democritus

The element, antimony (Sb) has two major isotopes of similar abundances, both around 50%.  The atomic mass of antimony is reported on the periodic table as 121.76.  Choose the most likely set of mass numbers for these two antimony isotopes.

• Antimony-121 and Antimony-123
• Antimony-120 and Antimony-127
• Antimony-123 and Antimony 122
• Antimony-121 and Antimony-118

Whose model is most similar to the solar system?

• Bohr
• Thomson
• Rutherford
• Dalton