The graph of neutron number against proton number shows three nuclei P, Q and R.

Which row identifies an isotope of P and the nucleon number of this isotope of P?

• Isotope of P: Q

  Nucleon number of isotope of P: y + 1

• Isotope of P: Q

  Nucleon number of isotope of P: x + y + 1

• Isotope of P: R

  Nucleon number of isotope of P: x + y + 1

• Isotope of P: R

  Nucleon number of isotope of P: x + 1

The decay of a neutral kaon K⁰ is given by the equation

K⁰ → X + Y + v̅_e

What are X and Y?

• e⁺ and e^–

• μ⁺ and e^–

• π⁺ and e^–

• π^– and e⁺

Tags

NGSS.HS-PS1-8

Fluoride ions are produced by the addition of a single electron to an atom of fluorine ¹⁹₉F

What is the magnitude of specific charge of the fluoride ion?

• 3.2 × 10^–26 C kg^–1

• 8.4 × 10^–21 C kg^–1

• 5.0 × 10⁶ C kg^–1

• 4.5 × 10⁷ C kg^–1

Tags

NGSS.HS-PS1-2

When a nucleus of the radioactive isotope ⁶⁵₂₈Ni decays, a β^– particle and an electron antineutrino are emitted.

How many protons and neutrons are there in the resulting daughter nucleus?

• Number of protons: 28

  Number of neutrons: 65

• Number of protons: 29

  Number of neutrons: 65

• Number of protons: 28

  Number of neutrons: 36

• Number of protons: 30

  Number of neutrons: 35

Tags

NGSS.HS-PS1-8

An atom of ¹⁶₇N gains 3 electrons.

What is the specific charge of the ion?

• 1.80 × 10⁷ C kg^–1

• –1.80 × 10⁷ C kg^–1

• 4.19 × 10⁷ C kg^–1

• –4.19 × 10⁷ C kg^–1

Electrons moving in a beam have the same de Broglie wavelength as protons in a separate beam moving at a speed of 2.8 × 10⁴ m s^–1.

What is the speed of the electrons?

• 1.5 × 10¹ m s^–1

• 2.8 × 10⁴ m s^–1

• 1.2 × 10⁶ m s^–1

• 5.1 × 10⁷ m s^–1

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

The composition of a carbon dioxide (CO₂) molecule is one atom of ¹²₆C and two atoms of ¹⁶₈O.

What is the number of molecules of CO₂ in 2.2 kg of the gas?

• 1.0 × 10²²

• 3.0 × 10²²

• 3.0 × 10²⁵

• 4.7 × 10²⁵

The radius of a nucleus of the iron nuclide ⁵⁶₂₇Fe is 4.35 × 10^–15 m.

What is the radius of a nucleus of the uranium nuclide ²³⁸₉₂U?

• 2.69 × 10^–15 m

• 2.89 × 10^–15 m

• 6.55 × 10^–15 m

• 7.05 × 10^–15 m

Which of the following nuclei has the smallest specific charge?

• 
• 
• 
• 

What is the best estimate for the order of magnitude for the diameter of an atom?

• 10⁻¹⁴ m

• 10⁻¹² m

• 10⁻¹¹ m

• 10⁻⁸ m