MODERN PERIODIC TABLE

2. a substance that contains atoms of two or more different elements, and these atoms are chemically joined together
5. chemical elements in group 18(8A) of the periodic table and the most stable due to having the maximum number of valence electrons (8) their outer shell can hold except helium
7. a pure substance that cannot be further broken down by any chemical reaction
9. measure of the ability of an atom in a chemical compound to attract electrons from another atom in the compound
11. energy required to remove an electron from a neutral atom of an element
12. specific patterns that are present in the periodic table that illustrate different aspects of a certain element, including its size and its electronic properties
14. defined as one - half the distance between the nuclei of identical atoms that are bonded together
15. a negatively charged ion
17. states that the physical and chemical properties of the elements recur in a systematic and predictable way when the elements are arranged in order of increasing atomic number
18. name for the six nonmetallic elements that constitute Group 17 (Group VIIa) of the periodic table and considered as most reactive nonmetals
19. a particle, atom or molecule with a net electrical charge.

1. formulated the Periodic Law and created a farsighted version of the periodic table of elements
2. a positively charged ion
3. an element that has properties that are intermediate between those of metals and nonmetals
4. an outer shell electron that can participate in the formation of a chemical bond
6. horizontal rows on the periodic table
8. vertical columns on the periodic table
10. energy change that occurs when an electron is acquired by a neutral atom
13. synthetic chemical element with atomic number 118 and considered as the noble gas
16. process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons