Question
Which of the following statements is true? (a) The atomic number is the same as the mass number (b) The atomic number is the same as the number of protons (c) The identity of a chemical element is determined by the number of valence electrons (d) The radius of all atoms can be measured precisely (e) Different isotopes of an element have different atomic numbers.
Answer
The atomic number is the same as the number of protons.
- Q: What is the definition of atomic number? A: Atomic number is the number of protons in an atom.
- Q: Which statement describes atomic number correctly? A: The atomic number is the same as the number of protons.