Answer :
Final answer:
Lithium is a metal, placed in the alkali metals group of the periodic table and is the least dense metal known. It exhibits typical metallic properties, including conducting electricity and malleability. Indium is also expected to be a metal due to its position in the periodic table. the correct answer is 1
Explanation:
Lithium (Li), with an atomic number of 3, is categorized as a metal. It is the first element in Group 1 of the periodic table, which comprises the alkali metals. Lithium's atomic structure includes two electrons in the first energy level and one electron in the second energy level, causing the third electron to be in an outer shell and leading to metallic properties such as malleability, electrical conductivity, and a characteristic luster. With a density of only 0.531 g/cm³, lithium is also notable for being the least dense metal.
Exercise on Indium
When predicting the classification of indium (In) based on its position in the periodic table, one would expect indium to be a metal, as it falls within the main group of metals.
