Covalent molecules starter

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Across
  1. 1. The type of electrons involved in covalent bonding. (6)
  2. 4. An element that forms a double covalent bond in O₂. (6)
  3. 6. Vertical columns on the periodic table, indicating elements with similar properties. (5)
  4. 8. An element that forms a triple covalent bond in N₂. (8)
  5. 10. An element that forms four covalent bonds in methane (CH₄). (6)
  6. 13. Electrons shared between atoms in a covalent bond. (5)
  7. 14. A halogen element with seven electrons in its outer shell. (8)
  8. 15. The outermost electrons, important in bonding. (7)
  9. 17. A group of elements in Group 7 of the periodic table. (7)
  10. 19. Subatomic particles in the nucleus of an atom with a positive charge. (7)
Down
  1. 2. A subatomic particle with a negative charge. (8)
  2. 3. A bond where atoms share pairs of electrons. (8)
  3. 5. Neutral subatomic particles found in the nucleus of an atom. (8)
  4. 7. A group of atoms bonded together covalently. (8)
  5. 9. The shells around an atom where electrons are found. (6)
  6. 11. The dense central part of an atom containing protons and neutrons. (7)
  7. 12. A type of bond formed by the transfer of electrons from one atom to another. (5)
  8. 13. Horizontal rows on the periodic table, showing elements with increasing atomic numbers. (6)
  9. 16. The smallest particle of an element that retains its chemical properties. (4)
  10. 18. The force that holds atoms together in molecules or compounds. (4)