Why do different isotopes of an element generally have the same physical and chemical properties?

• A. Because they have the same number of protons and electrons, which determine chemical behavior.
• B. Because they have identical numbers of neutrons, which control chemical reactions.
• C. Because isotopes always have the same nuclear stability.
• D. Because their atomic masses are always the same, leading to identical properties.

Answer: (A)

Verified step by step guidance

1. Understand that isotopes of an element have the same number of protons but different numbers of neutrons in their nuclei.
2. Recall that chemical properties are primarily determined by the arrangement and number of electrons, which are equal to the number of protons in a neutral atom.
3. Recognize that since isotopes have the same number of protons and electrons, their electron configurations are identical, leading to similar chemical behavior.
4. Note that neutrons affect the atomic mass and nuclear stability but do not significantly influence chemical reactions or physical properties related to electron interactions.
5. Conclude that isotopes generally have the same physical and chemical properties because their chemical behavior depends on protons and electrons, not on the number of neutrons.