S1.2 The nuclear atom
14 revision questions with answers for S1.2 The nuclear atom, marked SL. Read them here, or play the set as a class game on the projector. Free to host, and students join with a code.
Relative mass of an electron, taking a proton's as 1?
- 5 × 10⁻²
- 5 × 10⁻⁴Right answer
- 1
- 2 × 10³
What this set covers
Atomic structure and isotopes: the relative mass of an electron, counting protons, neutrons and electrons in ions, and calculating relative atomic mass from isotope abundances. Mass spectrometry closes the set.
- Common mix-up
- Students often mix up isotopes and isoelectronic species: isotopes share a proton number, while isoelectronic species such as Na⁺ and F⁻ share an electron count.
- Revision tip
- Work the chlorine and boron relative atomic mass questions again without looking, writing out each abundance multiplied by its mass number before you add.
All 14 questions and answers
Relative mass of an electron, taking a proton's as 1?
Answer: 5 × 10⁻⁴
Neutrons in ³⁷Cl (Z = 17)?
Answer: 20
Electrons in ³²S²⁻ (Z = 16)?
Answer: 18
Species with 12 protons, 12 neutrons and 10 electrons?
Answer: ²⁴Mg²⁺
Atoms with the same proton number but different neutron numbers?
Answer: Isotopes
Species with the same number of electrons, such as Na⁺ and F⁻?
Answer: Isoelectronic
Collective name for protons and neutrons?
Answer: Nucleons
Symbol for the mass number in nuclear notation?
Answer: A
Isotope used as the standard for relative atomic masses?
Answer: Carbon-12
Why do isotopes of an element have identical chemical properties?
Answer: Same electron configuration
Ar of chlorine with 75% ³⁵Cl and 25% ³⁷Cl?
Answer: 35.5
Ar of boron with 20% ¹⁰B and 80% ¹¹B?
Answer: 10.8
Instrument that measures the relative abundance of each isotope of an element?
Answer: Mass spectrometer
On a mass spectrum, the horizontal axis shows…?
Answer: Mass-to-charge ratio
Play it as a class game
Play this set opens it in splycr, where you can host it for your class straight away. Hosting needs no account: put the room code on the projector, and students join from a phone with the code and their first name. Each question plays as multiple choice, and the three wrong options were written for that question.