Atomic Structure_Intro to Chem

Subatomic particles with a negative charge

• Electrons

• Neutrons

• Protons

• Quarks

Subatomic particles with a positive charge

• neutrons
• atomic mass
• protons
• isotopes

Subatomic particles that are neutral in charge

• Neutrons
• Protons
• Nucleus 
• Electrons

Look at this picture of Argon off the periodic table. Which of the following is true for this element?

• 18 protons

• 40 protons

• 22 protons

• 21.9 protons

Which part of an atom is used to identify it?

• number of protons

• number of neutrons

• number of electrons

The atomic mass of an atom is equal to

• number of protons plus number of neutrons

• number of protons plus number of electrons

• number of electrons plus the number of neutrons

The nucleus of an atom is made of

• electrons and protons
• electrons and neutrons
• protons and neutrons
• empty space

Outside the nucleus of an atom are these

• protons
• neutrons
• quarks
• electrons

The mass of this particle is so small that it is not counted.

• proton
• electron
• neutron
• quark

The charge of the nucleus of all atoms or ions

• positive
• negative
• neutral
• sometimes positive and sometimes negative