Period 1 refers to the top row of the periodic table. These elements are Hydrogen and Helium.
the nonmetals are located in the right of the periodic table and only one (hydrogen) is located in group 1, period 1
Hydrogen is located on the first period; the first row in the periodic table.
1
Hydrogen is the first element in the periodic table of Mendeleev - atomic number 1. Hydrogen is placed in the group and period 1 of this table.
Yes, it is.
hydrogen
Hydrogen.
It is placed in group 1, period 1 on the modern periodic table
Hydrogen is, and always will be, Group 1 Period 1.
Classification of hydrogen is: group 1, period 1 in the periodic table of Mendeleev; hydrogen is the first element in this table.
Period 3 is the 3rd horizontal row. It is the 3rd row in periodic table.