The Periodic Table

3. The horizontal rows on the table, with the elements arranged in order of increasing atomic number.
10. Non-metals form blank by sharing an electron-pair between them.
11. Element with the lowest electronegativity.
14. the vertical columns on the table. These define a "family" of elements which have similar chemical properties
15. Electrons in this shell are called
17. chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.
18. English chemist who presented another way of classifying and organizing the elements.
20. Are elements that appear dull and are poor conductors of heat.
21. as "like a metal", which means that they conduct heat and electricity moderately well, and possess some properties of metals and some properties of non-metals.

1. Are elements that are shiny, ductile, and good conductors of heat and electricity.
2. Formed between non-metals and metals through an electron transfer.
4. German chemist who observed that several elements could be classified into sets of three which is called Triad
5. negatively charged ion is called
6. The outermost layer of an atom.
7. Eight valence electrons is described by the
8. An atom or a molecule that has an electrical charge is called
9. In the same group with the same electron configuration in their valence electron.
12. He reported the discovery of a new gaseous element ARGON This element is chemically inert and did not fit any of the known periodic groups.
13. type of covalent bond in which the electrons forming the bond are unequally distributed
16. positively charged ion is called
19. A group of elements that has full octet electrons.