Unit 2 Review - Atomic Structure

This number identifies an element and is equal to the number of protons in the nucleus of an atom.

• mass number

• atomic mass

• atomic number

• isotope

• relative abundance

The number of protons plus the number of neutrons in the nucleus of an atom is called the ....

• mass number

• atomic mass

• atomic number

• isotope

• relative abundance

The weighted average of the isotopes is called the

• mass number

• atomic mass

• atomic number

• isotope

• relative abundance

Atoms of the same element that have different number of neutrons are called

• mass number

• atomic mass

• atomic number

• isotopes

• relative abundance

The number of protons in the isotope ¹⁵N is...

The number of neutrons in the isotope ¹⁵N is...

The number of electrons in the isotope ¹⁵N is...

Which scientist performed the gold foil experiment and discovered that most of the mass in the atom is in the positively charged nucleus?

• Democritus

• Dalton

• Thomson

• Rutherford

• Bohr

Which scientist discovered the electron?

• Democritus

• Dalton

• Thomson

• Rutherford

• Bohr

Which scientist is credited with the atomic theory?

• Democritus

• Dalton

• Thomson

• Rutherford

• Bohr