The atomic number Z of an atom represents the:
Correct answer: A. Number of protons
- A. Number of protons
- B. Number of electrons and protons
- C. Number of neutrons
- D. Sum of protons and neutrons
Explanation
The atomic number Z of an atom represents the number of protons in the nucleus. Atomic number Z is equal to the number of electrons only for neutral atoms whereas for ions the number of electrons will be different from the number of protons. So, Z is the number of protons and our correct option is A.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Atomic Structure
Atomic structure covers the discovery of the proton, Planck's quantum theory, hydrogen emission spectra and the evidence for quantized energy levels. You will use quantum numbers to describe orbitals, distinguish s, p, d and f orbital shapes, and write electronic configurations, including the correct order of electron filling.
Practise Atomic Structure
922 free Atomic Structure MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Atomic Structure questions
The elements for which the value of ionisation energy is low, can:
Radon is _ emitter and being radioactive is used in _ treatment in radiotherapy.
The energy of electron in the first excited state of Hydrogen atom in J/atom is:
Quantum number which is not derived from Schrodingcr wave equation:
For a multi-electron atom, the highest energy level among the following is:
_is/are isoelectronic with K+: