1. A horizontal row of blocks in the periodic table is called a period.
2. Highly reactive metalic elements that react with water are called Alkali metals.
3. Group 18 has very low activity.
4. The Alkali metals are found on earth only in compounds because they are highly reactive elements.
5. Moving from left to right across a period 6, electrons are being added to the 4f orbital.
6. The property of an element that allows it to be squeezed into a wire is called ductility.
7. A substance is called malleable if it can be hammered into sheets.
8. A solution of 2 or more metals is called a alloy
9. At high temperatures electrons in semicondutors are exited to fill the conduction band, so semi coductors behave like metals.
10. Electrons in metals are free to move between metal atoms.
11. Nonmetalic elements in group 17 that react with metals to form salts are called halogens.
12. The electron configuration of main group elements ends in s and p orbitals.
13. The outer electron configuration of the alkali metals have 1 electron in the s orbital.
14. Elements in a period have similar electron configurations.
15. These elements that are good conductors of electricity are metals.
16. A metal can usually be recognized by its shiny appearance.
17. First ionization energy increases from left to right.
18. First ionization energy decreases down a group.
19. Noble gases tend to have the highest ionization energy and alkali metals have the lowest.
20. Period 1 tends to have the highest I.E. and period 4, the lowest.
21. As the atomic number of the metals of group 1 increase the ionic radius increases.
22. Across a period in the periodic table atomic radii gradually decrease.
23. Because the number of energy levels increase going down a group, the atomic radius generally increases with atomic number in each group of elements.
24. Because nuclear charge increases across a period, atoms become smaller.
25. As bonding between atoms become stronger, melting and boiling points tend to increase.
26. Electronegativity is the ability of an atom to attract electrons in a chemical bond.
27. An atoms electron affinity is the energy change that occurs when it gains an electron .