Atomic Structure Test - Chemistry

1. The chemical symbol for sodium is________

• na
• Na
• NA
• So

2. Which subatomic particle has a positive charge?

• electron
• neutron
• alpha particle
• proton

3. Which subatomic particle has a negative charge?

• alpha particle
• proton
• electron
• neutron

4. Which subatomic particle has a no charge?

• alpha particle
• proton
• electron
• neutron

5. Which statement about subatomic particles is true?

• Protons, neutrons, and electrons all have about the same mass.
• Unlike protons or neutrons, electrons have no mass.
• Neutrons have no charge and no mass.
• An electron has far less mass than either a proton or neutron.

6. Which of the following is unique for any given element?

• the number of neutrons
• the number of protons
• the charge on the electrons
• the mass of a neutron

7. The number of protons and neutrons in one atom of an element is that element’s

• mass number.
• atomic number.
• balanced charge.
• isotope.

8. Which subatomic particles are not in the nucleus?

• protons and neutrons.
• electrons
• Only protons.
• Only neutrons.

9. To find the number of neutrons in an atom, you would subtract

• mass number from atomic number.
• atomic number from electron number.
• atomic number from mass number.
• isotope number from atomic number.

10. What unit is used to measure the atomic mass?

• Atomic mass unit (amu)
• gram
• angstrom
• nanogram