chemistry

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Across
  1. 4. Is the column of chemical elements in periodic table
  2. 7. Is the tendency of an atom to attract a bonding pair of electrons to itself.
  3. 9. Between nucleus and valence electrons of Se is the strongest
  4. 10. To remove an electron from Se atom because of the strong attraction
  5. 11. Selenium formed
  6. 12. Down the group, the atomic radius
Down
  1. 1. Calcium formed
  2. 2. Has higher boiling point than strontium
  3. 3. Has the highest melting point among calcium and selenium
  4. 5. Is the row of chemical elements in the periodic table
  5. 6. Across the period, the atomic radius
  6. 8. Selenium and strontium have same electron