Răspuns:
a) X + Y + T = 21, conform ipotezei avem:
X + (X+1) + (X+2) = 21, unde (X+1) = Y si (X+2)=T
3x + 3 = 21
3x = 18 => x = 6
X = 6 Carbon ( C )
Y = 7 Azot ( N )
T = 8 Oxigen ( O )
b) p⁺ = e⁻ = Z
=> - Z Carbon = 6 e⁻
Configuratia: 1s², 2s², 2p²
- Z Azot = 7 e⁻
Configuratia: 1s², 2s², 2p³
- Z Oxigen = 8 e⁻
Configuratia: 1s², 2s², 2p⁴