Final answer:
Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons, leading to different atomic masses while maintaining identical chemical properties. Options 1 and 3 are true, stating that isotopes have the same number of protons but different numbers of neutrons and that they share the same chemical properties, respectively. Options 2 and 4 are false.
Step-by-step explanation:
When considering the electrically neutral isotopes 45Sc, 46Ti, and 47V, and evaluating the true statements among the given options, we must understand the concept of isotopes. Isotopes are atoms of the same element that contain the same number of protons and electrons but have different numbers of neutrons. Therefore, they have differing nuclear masses but identical chemical properties.
Option 1 is true: Isotopes have the same number of protons but different numbers of neutrons.
Option 2 is false: Isotopes do not have the same atomic mass; rather, they have different mass numbers due to varying neutron counts.
Option 3 is true: Isotopes of an element exhibit the same chemical properties as they have identical electronic structures.
Option 4 is false: Isotopes have the same number of protons; elements with different numbers of protons are different elements altogether, not isotopes.