If we look at the Periodic Table, we can see that the first element in Group I is Hydrogen.
The first element is hydrogen.Its atomic no. is 1 and atomic mass is 1.008.
The second element in group 1 is beryllium, with an atomic number of 4.
It is hydrogen. This element is the only one in its group because it is extremely unique and shares none of the properties of other gases.
If you think to sodium chloride (NaCl), sodium is from the first group and chlorine from the nine group.
Lithium is in the first period of the periodic table. It is the first element in the alkali metal group.
If you mean in the group {1, -1, i, -i, j, -j, k, -k}, the identity element is 1.
lithium is the third element. It is placed in group-1
The first element in the halogen group is fluorine. It is a highly reactive non-metal with a pale yellow hue.
That element would be in the Alkali Metals (group one)
It is hydrogen. This element is the only one in its group because it is extremely unique and shares none of the properties of other gases.
element K, or potassium
Hydrogen is located in the first row of group 1. It is separated by a slight space because it is unique in its properties as it can behave like a nonmetal despite being in group 1, which typically contains metals.