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Atoms consist of protons, neutrons, and electrons.
The atomic number indicates the number of protons.
Isotopes differ in the number of neutrons.
Electrons occupy fixed orbits around the nucleus.
It is the sum of protons and neutrons in an atom.
Electron shells represent different energy levels for electrons.
The chemical properties remain largely unchanged.
It reflects the weighted average of an element's isotopes.
It describes electron positions as probabilities rather than fixed orbits.
Protons define the element and its chemical behavior.
An isotope that decays and emits radiation over time.
It determines the atom's chemical properties and reactivity.
Atomic number counts protons; mass number counts protons and neutrons.
The number of protons in its nucleus.
Different numbers of neutrons in the same element.
The total number of protons and neutrons in an atom.
Their electrostatic interaction determines chemical properties.
Protons and neutrons.
It creates isotopes with similar chemical properties.
Approximately 1 atomic mass unit (amu).
They occupy most of the atom's volume.
It reflects the weighted average of isotopes.
The quantum model describes electron behavior as probabilities.
Negative (-1).
The identity of an element.
They have no fixed shape or volume.
It decays, allowing for radiocarbon dating.
The atom is about 50,000 times larger than the nucleus.
Protons and neutrons.