Across
- 3. the elements of the first two groups of the periodic table and helium
- 4. negatively charged ion formed from a halogen
- 6. element that has an atom with an incomplete d-sublevel or that gives rise to cations with an incomplete d-sublevel (elements in groups 3 to 11)
- 16. ions or atoms that have the same electron configuration.
- 17. horizontal row of the periodic table. All elements in the same row have their highest energy electron in the same principal energy level
- 18. elements from Z = 57 to Z = 71
- 21. energy change when 1 mole of atoms (or 1 mole of molecules) gain 1 mole of electrons to form 1 mole of negative ions in the gas phase
Down
- 1. elements in the central block of the periodic table, in which the d-subshell of an atom is being filled with electrons; the block of elements in the periodic table consisting of scandium, yttrium and lanthanum together with the three periods of transition elements; titanium to zinc, zirconium to cadmium and hafnium to mercury
- 2. repetition of similar properties because of similar valence electron configuration
- 5. half the distance between 2 nuclei in a covalent bond
- 7. a measure of how strongly an atom attracts the electrons in a chemical bond.
- 8. the block of elements in the periodic table consisting of the lanthanoid series (from cerium to lutetium) and the actinoid series (from thorium to lawrencium)
- 9. elements in groups 13 to 18 (excluding He) of the periodic table
- 10. theoretical distance between the nucleus of an atom and its outermost electron
- 11. an element that exhibits both metal and non-metal properties
- 12. the energy required to remove 1mole of electrons from 1mole of gaseous atoms.
- 13. outer energy level that is occupied by electrons
- 14. from 0 (least electronegative) to 4
- 15. vertical column of the periodic table. In the main group elements, the group number corresponds to the number of valence electrons
- 19. oxide which reacts both like an acidic oxide and a basic oxide
- 20. elements from Z = 89 to Z = 103