Periodic Table and Trends

5. a horizontal row (left to right) in the
6. an ion that has a negative charge.
7. arrangement of the elements in order of their atomic numbers such that elements with similar properties fall in the same column, or group.
9. the number of protons contained in each nucleus of its atoms of the element. Located over the elemental symbol
13. one of the metals located in Groups 3-12 and the lower portion of the p-block
16. An extremely unreactive group 18 element.
17. elements want to have 8e- in the outermost energy level
19. An element that has physical and chemical properties of both metals and nonmetals.
20. of the inner orbitals "shield" the outer electrons and they do not feel the pull of the nucleus as strongly.
22. a vertical column (up and down) on the periodic table.
23. attraction a nucleus has for electrons in a chemical bond
25. electrons that are located in the outermost energy level of an atom.

1. Group 1 metals of the periodic table that are very reactive with halogens and water. Form +1 ions
2. a substance that cannot be broken down into a simpler substance by ordinary chemical means.
3. an element or substance that conducts heat and electricity, is malleable and ductile and has low ionization energy and low electronegativity values
4. the process of adding or removing electrons from an atom or molecule, which gives the atom or molecule a net charge.
8. how big the atom is
10. describes how likely an element is to form bonds with other elements.
11. a vertical column (up and down) on the periodic table.
12. an atom that has gained or lost one or more electrons.
14. A highly reactive group 17 element.
15. Elements that may accept or donate electrons readily and possess a mixture of metallic and nonmetallic properties
18. charge of an atom's nucleus resulting from its number of protons
21. element that does not conduct electricity or heat and is usually a gas at room temperature
24. basic building block of matter
26. an ion that has a positive charge.