it has two element (hydrogen and helium) that are both gases although they are metallic and have a luster like tony baloney
Helium is in the first period of the periodic table.
it has two element (hydrogen and helium) that are both gases although they are metallic and have a luster like tony baloney
Hydrogen is located on the first period; the first row in the periodic table.
Period 1 refers to the top row of the periodic table. These elements are Hydrogen and Helium.
Hydrogen is found in group 1 row 1 of the periodic table
Sodium, Na, is in group 1 period 3 on the periodic table.
Lithium is in the first period of the periodic table. It is the first element in the alkali metal group.
1
Period 1
The first period of the periodic table's elements all have 1 energy level.
Hydrogen is included in the periodic table. It is the first element on the table and has an atomic number of 1. It is placed in Group 1 and Period 1 of the periodic table.
Francium is in the period 7 and group 1 of the periodic table (alkali metals).