Atoms and elements Transitional Reasoning Download PDF

Questions

1. 1.

   A chemist analyzes four gas samples to determine whether each represents an element or a compound based on subatomic data. Sample 1 consists of unbonded atoms each having 10 protons and 10 neutrons, Sample 2 consists of diatomic molecules formed exclusively by atoms each having 7 protons and 7 neutrons, Sample 3 consists of unbonded atoms where some have 6 protons and 6 neutrons while others have 6 protons and 8 neutrons, and Sample 4 consists of molecules formed by atoms with 1 proton chemically bonded to atoms with 8 protons. Based on the fundamental definition of an element, which statement correctly evaluates these samples?

   • A) Only Sample 1 represents an element because elemental substances cannot form diatomic molecules or contain atoms with differing neutron numbers.
   • B) Only Samples 1 and 2 represent elements because Sample 3 contains two distinct atomic masses and therefore constitutes a chemical compound.
   • C) Samples 1, 2, and 3 each represent an element because all constituent atoms within each sample share the same proton number, regardless of bonding state or neutron variation.
   • D) Samples 2 and 4 both represent chemical compounds because elements exist exclusively as unbonded individual atoms in nature.