А) Li, Be, B, C, N, O, F
Б) Сa, Mg, C, S, N, O, F
В) Ba, Na, Al, As, P, N, Cl, O, F
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А) Li, Be, B, C, N, O, F
Б) Сa, Mg, C, S, N, O, F
В) Ba, Na, Al, As, P, N, Cl, O, F