Chemical Symbol: B

Chemical Symbol: O

Chemical Symbol: Be

Chemical Symbol: Na

Chemical Symbol: Mg

Chemical Symbol: K

Chemical Symbol: He

Chemical Symbol: Al

Chemical Symbol: F

Chemical Symbol: Si

Chemical Symbol: P

Chemical Symbol: S

Chemical Symbol: Cl

Chemical Symbol: Ne

Chemical Symbol: Ar

Chemical Symbol: C

Which element has atomic number 1

Which element has atomic number 20

Which element has atomic number 2

Which element has atomic number 18

Which element has atomic number 5

Which element has atomic number 14

Which element has atomic number 9

Which element has atomic number 17

Which element has atomic number 11

Which element has atomic number 16

Which element has atomic number 3

Which element has atomic number 13

Which element has atomic number 8

Which element has atomic number 15

Which element has atomic number 6

Which element has atomic number 19

Which element has atomic number 10

Which element has atomic number 7

Which element has atomic number 4

Which element has atomic number 12