Periodic table element
Element name starts with its symbol's letter(s)
Listed in first 2 rows of the periodic table
Gaseous at STP
Lighter than air
Most flammable element
Periodic table element
Element name starts with its symbol's letter(s)
Listed in first 2 rows of the periodic table
Gaseous at STP
Lighter than air
Periodic table element
Element name starts with its symbol's letter(s)
Listed in first 2 rows of the periodic table
Gaseous at STP
Periodic table element
Element name starts with its symbol's letter(s)
Listed in first 2 rows of the periodic table
Periodic table element
Element name starts with its symbol's letter(s)
Periodic table element