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

Tags

NGSS.HS-PS1-7

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-PS2-4

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

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

Tags

NGSS.HS-PS1-7

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

Which nucleus has a smaller value of specific charge than the nucleus ¹⁸₈O?

• 
• 
• 
• 

Tags

NGSS.HS-PS1-8

When bombarded with an α particle the nuclide ²⁵₁₂Mg changes into another nuclide with the emission of a neutron and γ radiation.

What are the correct values for the nucleon number and proton number of the nuclide which is formed?

• Nucleon number: 29

  Proton number: 14

• Nucleon number: 29

  Proton number: 12

• Nucleon number: 28

  Proton number: 14

• Nucleon number: 27

  Proton number: 12

Tags

NGSS.HS-PS1-8

A calcium ion is formed by removing two electrons from an atom of ⁴⁰₂₀Ca . What is the specific charge of the calcium ion?

• 3.2 × 10^–19 C kg^–1

• 2.9 × 10^–18 C kg^–1

• 4.8 × 10⁶ C kg^–1

• 4.8 × 10⁷ C kg^–1