periodic table

1. the vertical columns on the table. These define a "family" of elements that have similar chemical properties.
3. the man who developed the concept of atomic number.
4. 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.
8. english chemist who presented another way of classifying and organizing the elements.
9. gasses a group of elements that has full octet electrons
10. positively charged ion
14. elements could be classified into sets of three
16. german chemist who observed that several elements could be classified into sets of three which is called Triad
17. An element in the periodic table that is represented by the letter H.
19. An element in the periodic table that is represented by the letter B.
20. negatively charged ion

2. An element in the periodic table that is represented by the letter O.
5. Process by which electrically neutral atoms or molecules are converted to electrically charged atoms or molecules (ions) through gaining or losing electrons.
6. A subatomic particle whose electric charge is negative one elementary charge.
7. the horizontal rows on the table, with the elements arranged in order of increasing atomic number.
11. An element in the periodic table that is represented by the letter S.
12. mass the average mass of the atoms of an element measured in atomic mass unit
13. table list of all known elements arranged in order of increasing atomic number in horizontal rows and elements which are chemically alike fall directly under one another
15. An element in the periodic table that is represented by the letter C.
18. An element in the periodic table that is represented by the letter K.