Предмет: Химия, автор: svetlana2678

помогите пожалуйста 1.Сложное вещество – это

1 – вода, 2 – сера, 3 – кислород

2. Относительная молекулярная масса наибольшая у вещества

1 – CO2, 2 – CH4, 3 – CS2.

3. Элемент третьего периода главной подгруппы 5 группы Периодической системы Д.И. Менделеева – это 1 – азот, 2 – фосфор, 3 – хлор.

4. Атом химического элемента, ядро которого содержит 14 протонов

1 – бериллий, 2 – хром, 3 – кремний.

5. Пара химических элементов, имеющих на внешнем электронном уровне 6 электрона

1 – О и Р, 2 – S и N 3 – O и S.

6. Элемент, электронная формула которого 1s22s22p3 – это

1 – N, 2 – P, 3 – S.

7. Простое вещество – неметалл

1 – алюминий, 2 – магний, 3 – графит, 4 – железо.

8. Химическая связь является ковалентной неполярной в веществе

1 – железо, 2 - хлор, 3 – вода.

Ответы

Автор ответа: xaxaxaxaxaoo
8
1. 1
2. 3
3.2
4. 3
5. 3
6. 1
7. 4
8. 2
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