Periodic Table Puzzle

1234567891011
Across
  1. 2. gas This chemical series contain helium, neon, argon, krypton
  2. 4. The group are very reactive metals that do not occur freely in nature.
  3. 5. Which element has the lowest atomic mass.
  4. 7. Which element has an atomic number of 26.
  5. 8. It’s semi-metal and atomic number is 14
  6. 9. Earth The group readily lose two electrons to form cations with a 2+ charge.
  7. 11. It is only metal element that is liquid at room
Down
  1. 1. The most electronegative element.
  2. 3. The group have high negative value of electron affinity.
  3. 6. The most gas in the air.
  4. 10. What is the alkali metal on period 2?