14. Solving a chemistry problem
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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.
b) the element of the fifth period, the highest oxide XO2, does not give gaseous compounds with hydrogen.
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