The word famous is not adequate in chemistry.
The first group of the Periodic Table of Mendeleev contain: lithium, sodium, potassium, rubidium, caesium, francium. The most common element in this group is of course sodium.
Lithium
Lithium!
oxygen
i think the element will be lithium that's what i think
Lithium
The most reactive is fluorine.
No - the lightest elements are hydrogen and helium. Although lithium is a lightest metal and the lightest element that is a solid at room temperature.
Oxygen is more electronegative than lithium. Electronegativity refers to an element's ability to attract electrons in a chemical bond, and oxygen has a higher electronegativity value compared to lithium on the periodic table.
lithium and fluorine
The element in the liquid with formula L2Br is Lithium.
Lithium is a highly reactive element because it has a single electron in its outer shell, making it eager to donate that electron to achieve a stable electron configuration. This property allows lithium to readily form compounds with other elements.
Lithium is element #3. That, of course, is the atomic number - the number of protons. The atomic mass will of course depend on the specific isotope. The most common isotope is Lithium-7, that is, atomic mass = 7. Lithium-6 also occurs in nature as a stable isotope.