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Chemistry orbitals

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    I recently started chemistry A level and have been learning about the sub leveland orbitals of atoms. i was wondering why argon is stable when 3p is full even though 3d is not full. YES ik 4s is filled first, nut shouldn't it still not be stable. if so how come when the 4s orbital is full in calcium how come this is not stable. PLEASE HELP
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    It doesn't need a full shell to be stable. It would however, be reactive. An atom is unstable if it has a different number of electrons than protons.
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    (Original post by TomHibbs12)
    It doesn't need a full shell to be stable. It would however, be reactive. An atom is unstable if it has a different number of electrons than protons.
    I'm talking about the outer shell being full :/ why is it a noble gas if the main energy level isn't full
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    Errm not sure. Looked this up and I'd think more simply - structure is 2.8.8, therefore has a full third 'shell'. I'm asking chemistry teacher.
 
 
 
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