Atoms and molecules Knowledge-Based Download PDF

Questions

1. 1.

   Two neutral atoms have the same atomic number but possess different mass numbers due to a variation in their subatomic composition. Which term correctly identifies these variants of the same chemical element?

   • A) Ions
   • B) Isomers
   • C) Free radicals
   • D) Isotopes
2. 2.

   Which fundamental property uniquely determines the chemical identity of an atom as a specific element?

   • A) The number of neutrons in the atomic nucleus
   • B) The number of electrons occupying the outer energy level
   • C) The total mass contributed by all subatomic particles
   • D) The number of protons contained within the atomic nucleus
3. 3.

   Which characteristic of an atom directly determines the number of covalent bonds it can form with other atoms to produce a stable molecule?

   • A) The total number of neutrons present within the atomic nucleus
   • B) The overall atomic mass determined by the combined protons and neutrons
   • C) The number of paired electrons residing in its innermost energy level
   • D) The number of unpaired electrons required to complete its outermost valence shell
4. 4.

   Which subatomic particles are shared, gained, or lost by atoms during the formation of chemical bonds to create molecules?

   • A) Valence electrons
   • B) Nuclear protons
   • C) Core neutrons
   • D) Alpha particles
5. 5.

   Which of the following statements correctly describes the relationship between atoms and molecules?

   • A) A molecule is composed of two or more atoms held together by chemical bonds, whereas an atom is the basic unit of a chemical element.
   • B) An atom is composed of two or more molecules linked together by covalent bonds, whereas a molecule cannot be broken down further.
   • C) A molecule consists solely of subatomic particles within a nucleus, whereas an atom includes surrounding electron orbitals.
   • D) An atom is formed only when chemically distinct molecules share valence electrons to reach a stable state.