Elements
1st element
Hydrogen
The group lithium is in
Alkali Metals
Atomic number for Hydrogen
1
Calcium Number
20 on periodic table
Magnesium group
Potassium's atomic number
19
4th element
Berrylium
Bromines group
the Halogens
Borons atomic number
5
2nd Element
Helium
Sulfur's Group
Oxygen group
Argons atomic number
18
30 atomic number
Heliums Group
Noble gases
oganesson atomic number
118