Personal problems Flashcards
Overall charge of an atom
Neutral
Nucleus charge
Positive
Atomic mass is
Protons + neutrons
Ground state
Electrons in lowest possible energy
When electrons move to a lower level/orbital
Emits energy usually light. To see use tool spectroscope
When electron gains energy
It moves to the higher orbital/level
Valence electrons
Electrons on most outer orbital and define the chemical properties
Stable atom + exception
8 valence electrons. Hydrogen and Helium only have 2
Lewis dot structure
Shows number of valence of electrons
Protons dictate
The element itself- different number of protons = different element
Average atomic mass is
the weighted average of its naturally occurring isotopes
Unstable nuclei
Emit radiation
Stable isotopes vs unstable
Stable has 1:1 ratio protons neutrons. Radioactive/unstable has twice neutrons than protons
Transmutation
Mutilation of nucleus. Artificial transmutation required bombarding nucleus with energy
Spontaneous decay
involve the release of different particles from the nucleus. The particles, as well as their masses and charges, can be found on Table O
