Unit 3: Atomic Structure

What is the smallest possible unit of an element?

• Atom

• Proton

• Neutron

• Electron

Which of these is not located in the nucleus?

• Electron

• Proton

• Neutron

Which of the following are correctly matched?

• Electron: mass of 1 amu

• Proton: no mass

• Neutron: negative charge

• Electron: negative charge

Select which particles are found in the nucleus

• Proton

• Neutron

• Electron

In a neutral atom, which of these is true?

• # of protons = # of electrons

• # protons < # of electrons

• # of protons + # of electrons = 0

• # of protons > # of electrons

Which of these is true?

• Isotopes are the same element but have a different # of protons

• Isotopes are the same element but have a different # of neutrons

• Isotopes are the same element but have different masses

• Isotopes are the same element but have a different atomic number

In a neutral atom, which of these is the atomic number is equal to

• # of protons

• # of electrons

• # of neutrons

• Atomic mass

Which of these is true of the isotope krypton-84?

• Its mass is 84

• Its atomic number is 84

• It has 84 protons

• It has 84 neutrons

Atomic mass =

• protons + neutrons

• protons + neutrons + electrons

• atomic number - neutrons

• neutrons + electrons

Which form of radiation requires the thickest material to block it?

• Alpha

• Beta

• Gamma

• Neutrons