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Periodic Table crossword

Periodic Table1234567891011121314
Tap a square and type. Tap it again to switch direction.

Across

  1. 2 Horizontal row on the chart
  2. 4 ___ metals: the very reactive first column
  3. 6 Gas that makes balloons float
  4. 7 Element we breathe, symbol O
  5. 8 Symbol Na, one half of table salt
  6. 10 Rightmost column, famously unreactive
  7. 12 Element number one, lightest of them all
  8. 14 Element once coiled inside light bulbs

Down

  1. 1 Metal with symbol Fe, needed in your blood
  2. 2 Positive particle whose count gives the atomic number
  3. 3 Group including fluorine and chlorine
  4. 5 Same element, different neutron count
  5. 9 Russian chemist who arranged the elements into rows
  6. 11 Only metal that is liquid at room temperature
  7. 13 Symbol Au, prized yellow metal

About this puzzle

A 21 by 19 crossword with 8 across and 7 down, on the subject of Periodic Table.

Grid
21 x 19
Across
8
Down
7
Longest answer
NOBLEGASES (10 letters)
Show the answer key
  1. 1 down: IRON. Metal with symbol Fe, needed in your blood
  2. 2 across: PERIOD. Horizontal row on the chart
  3. 2 down: PROTON. Positive particle whose count gives the atomic number
  4. 3 down: HALOGEN. Group including fluorine and chlorine
  5. 4 across: ALKALI. ___ metals: the very reactive first column
  6. 5 down: ISOTOPE. Same element, different neutron count
  7. 6 across: HELIUM. Gas that makes balloons float
  8. 7 across: OXYGEN. Element we breathe, symbol O
  9. 8 across: SODIUM. Symbol Na, one half of table salt
  10. 9 down: MENDELEEV. Russian chemist who arranged the elements into rows
  11. 10 across: NOBLEGASES. Rightmost column, famously unreactive
  12. 11 down: MERCURY. Only metal that is liquid at room temperature
  13. 12 across: HYDROGEN. Element number one, lightest of them all
  14. 13 down: GOLD. Symbol Au, prized yellow metal
  15. 14 across: TUNGSTEN. Element once coiled inside light bulbs

Questions

How many clues does this Periodic Table crossword have?
8 across and 7 down, on a 21 x 19 grid. The longest answer is NOBLEGASES (10 letters).
How do I switch between across and down?
Tap a square to type into it, and tap the same square again to turn the corner. The answer you are filling is shaded on the grid and its clue lights up in the list, so you always know which one you are on.
Will it tell me when a letter is wrong?
Only when you ask. Press Check letters and any wrong letter is marked. A crossword is solved by reasoning across two answers at once, and flagging a letter the moment it is typed takes that away.
Can I print this crossword?
Yes. The printable version carries the same grid and clues with the answer key, at three difficulties.
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