Constituents of the atom

Q1. Which of the following correctly gives the charge and mass of a proton in SI units?

Multiple Choice · 1 point

• · Charge = +1.6 × 10⁻¹⁹ C, mass = 1.67 × 10⁻²⁷ kg
• · Charge = -1.6 × 10⁻¹⁹ C, mass = 1.67 × 10⁻²⁷ kg
• · Charge = +1.6 × 10⁻¹⁹ C, mass = 9.11 × 10⁻³¹ kg
• · Charge = 0 C, mass = 1.67 × 10⁻²⁷ kg

Q2. Which row correctly gives the relative charge and relative mass of a neutron?

Multiple Choice · 1 point

• · Relative charge = 0, relative mass = 1
• · Relative charge = +1, relative mass = 1
• · Relative charge = 0, relative mass = 0
• · Relative charge = -1, relative mass = 1

Q3. How does the mass of an electron compare to the mass of a proton?

Multiple Choice · 1 point

• · The electron is approximately 1836 times lighter than the proton
• · The electron has the same mass as the proton
• · The electron is approximately 1836 times heavier than the proton
• · The electron is approximately 4 times lighter than the proton

Q4. Specific charge is defined as which of the following?

Multiple Choice · 1 point

• · Charge multiplied by mass
• · Mass divided by charge
• · Charge divided by mass
• · Charge divided by the number of nucleons

Q5. A nucleus has proton number 8 and nucleon number 16. What is its specific charge? (charge of proton = 1.6 × 10⁻¹⁹ C, mass of nucleon = 1.67 × 10⁻²⁷ kg)

Multiple Choice · 1 point

• · 9.58 × 10⁷ C kg⁻¹
• · 4.79 × 10⁷ C kg⁻¹
• · 2.40 × 10⁷ C kg⁻¹
• · 1.60 × 10⁷ C kg⁻¹

Q6. In the nuclide notation ²³⁸₉₂U, what do the numbers 238 and 92 represent respectively?

Multiple Choice · 1 point

• · Nucleon number and proton number
• · Proton number and nucleon number
• · Nucleon number and neutron number
• · Mass number and electron number

Q7. A nuclide is written as ⁵⁶₂₆Fe. How many neutrons does this nucleus contain?

Multiple Choice · 1 point

• · 26
• · 56
• · 30
• · 82

Q8. Which of the following best defines isotopes of an element?

Multiple Choice · 1 point

• · Atoms with the same nucleon number but different proton numbers
• · Atoms with the same proton number but different nucleon numbers
• · Atoms with the same mass but different charges
• · Atoms with the same number of neutrons but different numbers of electrons

Q9. Carbon-12 and Carbon-14 are isotopes. Which of the following correctly describes how they differ?

Multiple Choice · 1 point

• · They have different numbers of protons
• · Carbon-14 has two more neutrons than Carbon-12
• · They have different numbers of electrons in the neutral atom
• · Carbon-14 has two fewer protons than Carbon-12

Q10. Put the following particles in order from smallest to largest specific charge.

Ordering · 1 point

• 1. Neutron
• 2. Proton
• 3. Nucleus of ⁴₂He (alpha particle)
• 4. Electron