the chemical element of atomic number 9, a poisonous pale yellow gas of the halogen series. It is the most reactive of all the elements, causing severe burns on contact with skin.
what is fluorine
100
sodium
this element has 11 protons
100
boron
what is B
100
26.982
aluminum
200
krypton
this element is located in group 18 and period 4
200
the chemical element of atomic number 5, a nonmetallic solid.
what is boron
200
iron
this element has 26 protons
200
nickel
what is Ni
200
196.967
gold
300
fluorine
this element is located in group 17 and period 2
300
Lead is a chemical element in the carbon group with symbol Pb and atomic number 82. Le post-transition metal.
what is lead
300
silver
what is Ag
300
114.82
indium
400
mercury
this element is located in group 12 and period 6
400
he chemical element of atomic number 12, a silver-white metal of the alkaline earth series.
what is magnesium
400
radium
this element has 88 protons
400
silicon
what is Si
400
30.974
phosphorus
500
radon
this element is located in group 18 and period 6
500
he chemical element of atomic number 30, a silvery-white metal that is a constituent of brass