Which technique is used to detect the isotopes of an element?

• Mass spectrometry

• Infrared spectroscopy

• Titration

• Recrystallization

What is represented by A in this isotope?

• Number of electrons

• Number of neutrons

• Number of nucleons

• Number of protons

Which is correct for this isotope?

• 16 protons; 18 neutrons; 14 electrons

• 18 protons; 16 neutrons; 18 electrons

• 16 protons; 18 neutrons; 16 electrons

• 16 protons; 18 neutrons; 18 electrons

Which statement about ⁵⁶Fe³⁺ and ⁵⁴Fe²⁺ is correct?

• Both have the same numbers of protons and electrons.

• Both have the same number of protons.

• Both have the same number of neutrons.

• Both have the same numbers of protons and neutrons.

Which shows the number of subatomic particles in ³¹P³⁻ ?

• A

• B

• C

• D

What is the composition of the nucleus of ²⁶Mg?

• A

• B

• C

• D

What is the number of protons and the number of neutrons in ¹³¹I?

• A

• B

• C

• D

In which set do all the species contain more electrons than neutrons?

• ¹⁴N, ¹⁶O, ¹¹C

• ¹⁴N, ¹⁶O, ¹¹C^4–

• ¹⁴N^3–, ¹⁶O^2–, ¹¹C

• ¹⁴N^3–, ¹⁶O^2–, ¹¹C⁴⁺

What does this symbol represent?

• An ion with 12 protons and 24 neutrons

• An ion with 14 protons and 24 neutrons

• An ion with 12 protons and 12 neutrons

• An ion with 12 protons and 22 neutrons

Which is correct for the chromium isotope?

• 24 neutrons and 53 nucleons

• 24 protons and 29 nucleons

• 24 protons and 29 neutrons

• 24 electrons and 53 neutrons