Chemistry Honors Review - Atomic Theory

Which subatomic particle was discovered by J.J. Thomson using the cathode ray tube experiment?

• Proton

• Electron

• Neutron

• Positron

What is the AZX notation for an isotope of carbon with 6 protons and 8 neutrons?

Tags

NGSS.MS-PS1-1

Which statement best describes an ion?

• An atom with equal numbers of protons and electrons

• An atom with a different number of neutrons and protons

• An atom that has gained or lost electrons

• An atom with a different number of protons and electrons

Which scientist proposed the nuclear model of the atom after the gold foil experiment?

• John Dalton

• J.J. Thomson

• Ernest Rutherford

• Niels Bohr

Tags

NGSS.HS-PS1-8

• 17

• 18

• 35

• 52

Which of the following statements about isotopes is correct?

• Isotopes have the same number of protons but different numbers of neutrons.

• Isotopes have different numbers of protons and electrons.

• Isotopes have the same mass number but different atomic numbers.

• Isotopes have different chemical properties.

What is the charge on an ion of magnesium with 12 protons and 10 electrons?

Which model of the atom first introduced the idea of quantized energy levels for electrons?

• Dalton’s model

• Thomson’s model

• Rutherford’s model

• Bohr’s model

• The average atomic mass is the arithmetic mean of the two isotopes’ masses.

• The average atomic mass is closer to the mass of the more abundant isotope.

• The average atomic mass is always exactly halfway between the two isotopes’ masses.

• The average atomic mass is not affected by isotope abundance.

A neutral atom of element X has a mass number of 23 and contains 11 electrons. Write the AZX notation for this atom and explain your reasoning.