IOM 2018, Блиц, английски — Задача 7

OLYMPIAD OF METROPOLISES. Moscow, September 3 · 3 септември 2018 г.

Условие

The letters $a$, $b$, $c$, and $d$ are arbitrary symbols that represent four elements with consecutive atomic numbers in the periodic table. An atom of element $c$ has one valence electron. N represents an atom of nitrogen. Choose the correct formula.

1. $a_3c_2$ 2)$b_3N_2$ 3) $da$ 4) $d_3N_2$

Отговори

Решение

Оригинал в Архива: blitz.pdf · официални решения: blitz-answers.pdf