Question

Identify the nobel gas proceeding the metal

Li, lithium, is located in group 1A and in period 2 of the periodic table. Identify the preceding noble gas.

Answer 1

The noble gas preceding lithium (Li) in the periodic table is helium (He), which is located in group 18 of period 1.

Step-by-step explanation:

The noble gas preceding the metal lithium (Li) in the periodic table is helium (He). Since lithium is located in group 1A (or group 1 in the alternative numbering system) and in period 2, the preceding noble gas must be from period 1. The noble gases are in group 18 (or group 8A), so the preceding noble gas is the one located in group 18 of period 1, which is helium.

Lithium is an alkali metal and it is the first element in group 1 after the noble gas helium. The elements within a period of the periodic table are arranged in ascending order of atomic number. So, after helium (He), which has an atomic number of 2, comes lithium (Li) with an atomic number of 3.