Periodic Table

2. – the ability of an atom to attract an electron when the atom is in a compound
3. – Vertical rows (columns) representing the number of outer most (valence) electrons.
7. –”f”-shell outer electrons
8. – Very reactive metals (Group 1 or 1A)
11. – an element that lacks metallic attributes, highly volatile (goes into the gas state easily), have low elasticity, and are good insulators of heat and electricity. They are mostly gases. There are 17 on the periodic table.
12. – An element that is typically hard, opaque, shiny, and has good electrical and heat conductivity, malleable (pounded into a thin sheet), fusible and ductile (made into wires). They are mostly solids at room temp.
14. - an element with properties in between those of metals and non-metals. These are usually solids at room temp. There are 7 on the periodic table.
15. – reactive metals (Group 2 or 2A)
16. atom with a positive charge
19. – always smaller than the parent atom for cations and always larger than the parent atom for anions.
20. – atom with a negative charge
21. – elements, when listed in order of their atomic numbers, fall into recurring groups , so that elements with similar properties occur at regular intervals.

1. – “s” and “p”- subshell outer electrons (Groups 1, 2, 13-18 or Group A elements)
4. – Electrons in the outermost energy level
5. – Very reactive non-metals (Group 17 or 7A)
6. – the energy required to remove an electron.
9. – ½ the distance between the nuclei of 2 atoms of the same element
10. – Non-reactive non-metals (Group 18 or 8A)
13. – “d” – subshell outer electrons
17. - an atom with a ‘permanent’ elementary charge
18. – Horizontal rows representing the energy level of the outer most (valence) electrons.