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²³ ₁₁ Na
protony=11
elektrony=11
neutrony=23-11=12
O-16 to
¹⁶ ₈ O
protony=8
elektrony=8
neutrony=16-8=8
Al-27 to
²⁷ ₁₃ Al
protony=13
elektrony=13
neutrony=27-13=14