Atomic Structure

Which particle contributes the negative charge to the atom?

• proton
• electron
• neutron
• nucleus

Which particle does not contribute mass to the atom?

• Proton
• Neutron
• Electron
• Nucleus

What scientist is best known for his gold foil experiment?

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

Who is the first scientist to think that the atom was the smallest unit of matter?

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

What element has 3 p⁺?

• nitrogen
• lithium
• beryllium
• carbon

The three main subatomic particles are electrons, protons and ____________.

• photons
• neurons
• neutrons
• quarks

What are the two main parts of the atom?

• nucleus and cytoplasm
• nucleus and electron cloud
• core and electron cloud
• protons and neutrons

What is the standard unit of mass at the atomic level?

• centimeters
• millimeters
• amu
• milligrams

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

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

What is the electrical charge of a proton?

• 1+
• 1-
• neutral
• 2-