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Atomic Structure flashcards
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- What is atomic number?Subatomic Particles
- Number of protons in an atom’s nucleus.
- What makes a neutral atom?Subatomic Particles
- Equal numbers of protons and electrons.
- What determines an element’s identity?Subatomic Particles
- Its proton count.
- How is neutron count calculated?Subatomic Particles
- Mass number minus atomic number.
- How does a positive ion form?Subatomic Particles
- It loses electrons in the ordinary ionic model.
- Does losing electrons change an isotope’s mass number?Subatomic Particles
- No; its proton and neutron counts are unchanged.
- What is mass number A?Isotopes
- Proton count plus neutron count.
- How are isotopes related?Isotopes
- Same element proton number, different neutron number.
- How is an ion different?Isotopes
- Its electron count differs from the neutral atom.
- Why is periodic-table atomic mass often noninteger?Isotopes
- It reflects isotope abundances and masses.
- Why are isotopes the same element?Isotopes
- They have the same number of protons.
- What does isotope abundance mean?Isotopes
- The fraction of atoms of that isotope in a sample.
- What is a weighted atomic mass?Isotopes
- An abundance-weighted mean of isotope masses.
- Is mass number the same as measured isotope mass?Isotopes
- No; mass number counts nucleons, while isotope mass is measured.
- What did scattering evidence support?Atomic Models
- A compact, positively charged atomic nucleus.
- What is a line spectrum?Atomic Models
- Discrete wavelengths emitted or absorbed by atoms.
- What is an energy level?Atomic Models
- An allowed atomic energy state in a model.
- What did cathode-ray experiments help identify?Atomic Models
- Negatively charged electrons.
- What did large-angle alpha scattering reveal?Atomic Models
- A small dense positively charged nucleus.
- What is an orbital?Atomic Models
- A quantum description of probable electron location.
- What supplies an emitted photon’s energy?Atomic Models
- The electronic energy-level difference.