Engchem

Which of the following statements is true for a ¹⁴C?

• it has 6 protons and 8 neutrons

• it has 6 protons and 6 neutrons

• it has 12 protons and 12 neutrons

• it has 12 protons and 8 neutrons

• none of these

Which of the following statements is true for a ³⁷Cl^– anion?

• it has 17 protons, 18 electrons, and 20 neutrons

• it has 17 protons, 16 electrons, and 17 neutrons

• it has 37 protons, 37 electrons, and 20 neutrons

• it has 20 protons, 8 electrons, and 11 neutrons

• none of these

Which of the following statements is true for a ²⁵Mg⁺² cation?

• it has 12 protons, 14 electrons, and 12 neutrons

• it has 12 protons, 10 electrons, and 12 neutrons

• it has 12 protons, 10 electrons, and 13 neutrons

• it has 24 protons, 12 electrons, and 24 neutrons

• none of these

Beta emission is associated with __________

• conversion of a neutron to a proton.

• conversion of a proton to a neutron.

• increase in mass number.

• decrease in mass number by 4 and atomic number by 2.

• emission of γ rays.

Electron-capture is associated with __________

• conversion of a neutron to a proton.

• conversion of a proton to a neutron.

• increase in mass number.

• decrease in mass number by 4 and atomic number by 2.

• emission of γ rays.

Alpha emission is associated with __________

• conversion of a neutron to a proton.

• conversion of a proton to a neutron.

• increase in mass number.

• decrease in mass number by 4 and atomic number by 2.

• emission of γ rays.

Positron emission is associated with __________

• conversion of a neutron to a proton.

• conversion of a proton to a neutron.

• increase in mass number.

• decrease in mass number.

• emission of γ rays.

The first step in the disintegration of uranium is ²³⁸U --> ²³⁴Th. What particle is emitted in this reaction?

• α particle

• neutron

• proton

• electron

• γ ray

The isotope Cr–53 is produced by the beta decay of which of the following:

• ⁵³Mn

• ⁵⁴Cr

• ⁵²Cr

• ⁵³V

• ⁵⁴V

What other particle is formed in the fusion of two protons to form deuterium (H-2)?

¹H + ¹H --> ²H + ?

• proton

• neutron

• electron

• positron

• γ ray