14. Решение задачи по химии №001 485

2. Name the element according to the following data: a) an element of the fourth period, the highest oxide X2O7, forms a gaseous compound HX with hydrogen;
b) the element of the fifth period, the highest oxide XO2, does not give gaseous compounds with hydrogen.

If you do not open the file - install the RAR archiver. Inside the archive you will find a solution in Word format.