Periodic Classification of Elements
Crossword
Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number.
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Across:
1.
The distance between the centre of the nucleus and the outermost shell of an isolated atom.
3.
atoms of the same element having different atomic mass but same atomic number
4.
inert gases
Down:
1.
the volume occupied by one mole atoms of the element at its melting point, in solid state.
2.
the distance from the nucleus to the valence shell where the valence electrons are located
OK