Atoms Test

What is the smallest unit of matter that retains the properties of an element?

• Molecule
• Atom
• Electron
• Proton

Which subatomic particle has a negative charge?

• Nucleus
• Electron
• Neutron
• Proton

What is the central part of an atom called?

• Neutron core
• Electron cloud
• Proton center
• Nucleus

Which subatomic particle has no electrical charge?

• Neutron
• Electron
• Positron
• Proton

What is the atomic number of an element?

• Number of protons
• Number of neutrons
• Number of electrons
• Sum of protons and neutrons

How many protons does a neutral atom of carbon have?

• 14
• 12
• 8
• 6

What is the mass number of an atom?

• Sum of protons and neutrons
• Number of electrons
• Number of neutrons
• Number of protons

Which of the following is NOT a subatomic particle?

• Proton
• Neutron
• Electron
• Molecule

What determines the chemical identity of an atom?

• Number of electrons
• Number of neutrons
• Atomic mass
• Number of protons

How many electrons does a neutral atom of oxygen have?

• 10
• 16
• 8
• 6