Chapter 6 Periodic Table

6. an atom or group of atoms that have a positive or negative charge.
7. The modern day periodic table is arranged by? (2 words)
8. An ion with a negative charge.
9. How did Mendeleev organize his periodic table? (2 Words)
13. Good conductors of heat and electric current.
15. The ability of an atom of an element to attract electrons when the atom is in a compound.
19. atomic size(radius)________ from top to bottom within a group.
20. How many elements were identified by 1700?
21. The nonmetals of group 7A are called?
24. the group B elements that are usually displayed in the main body of a periodic table? (2 words)
25. Positive and negative ions form when __________ are transferred between atoms.

1. one half of the distance between the nuclei of two atoms of the same element when the atoms are joined. (2 Words)
2. The elements in group 2A are called? (3 words)
3. poor conductors of heat and electric current.
4. The energy required to remove an electron from an atom.
5. The elements in group 8A are called? (2 words)
8. The elements in group 1A are called? (2 Words)
10. Most of the elements of the periodic table are?
11. Early chemists used ____________ to sort the elements into groups.
12. How many electrons does the d orbital hold?
14. An ion with a positive charge.
16. Elements in group 1A-7A are often referred to as? (2 words)
17. When the elements are arranged in order of increasing atomic number, there is a periodic repetition of their physical and chemical properties. (2 words)
18. Generally has properties that are similar to those of metals and nonmetals.
22. What element is a liquid at room temperature that is in period six?
23. Electronegativity values ____________ from top to bottom within a group.