Across
- 3. is the very first element on the periodic table
- 5. atomic symbol is B and its atomic number is 5
- 6. has the secound smallest atomic number
- 7. has 1 valance electron
- 9. its atomic number is 10 it is a noble gas
Down
- 1. discovered in 1898 chemical symbol
- 2. horizonal on the periodic table
- 4. has 8 valence electrons
- 8. the element under hydrogen