Which of the following elements can conveniently be placed in two groups in the periodic table ?
Answer Details
The element that can conveniently be placed in two groups in the periodic table is hydrogen.
Hydrogen is the first element in the periodic table and has an atomic number of 1. It is located in group 1 of the periodic table because it has only one valence electron and shares many chemical properties with the alkali metals, such as lithium and sodium.
However, hydrogen also shares some chemical properties with the halogens, such as fluorine and chlorine, which are located in group 17 of the periodic table. Like the halogens, hydrogen can form a single covalent bond by sharing one electron with another atom, and it can also form negative ions called hydrides, which have similar properties to halides.
Therefore, hydrogen can be placed in two groups in the periodic table: group 1 and group 17. However, its properties are more similar to the alkali metals than the halogens, so it is generally classified as a nonmetal or a metalloid rather than a halogen.
In conclusion, hydrogen is the element that can conveniently be placed in two groups in the periodic table: group 1 and group 17.