The chemical element forms an oxide of the composition E2O with a molar

The chemical element forms an oxide of the composition E2O with a molar mass of 94 g / mol. define this element. name it a character property

Given:
M (E2O) = 94 g / mol

To find:
NS – ?

Solution:
1) Using the periodic system of D.I.Mendeleev, calculate the atomic mass of a chemical element:
M (E2O) = Mr (E2O) = Ar (E) * N (E) + Ar (O) * N (O);
94 = Ar (E) * 2 + 16 * 1;
Ar (E) = 39;
2) Chemical element – K – potassium;
3) Properties: alkali metal, chemically active, strong reducing agent, so that there is no contact with the atmosphere, it is necessary to store it in gasoline, kerosene or silicone.

Answer: Unknown chemical element – K – potassium.