The Atom and Elements

2. The number that represents the amount of protons in an atom's nucleus.
4. A way to represent electron shells or orbitals around the nucleus of an atom.
6. The elements in families 3-11 on the Periodic Table; can lose an assortment of electrons.
8. The part of an atom that is negatively charged, and has a specific energy; located in the 'cloud' outside the atom's nucleus.
9. The part of an atom that is neutral, and is contained in the nucleus.
10. The average mass of all the isotopes; represents how much each proton and neutron weigh.
11. Elements with more than four electrons on their outer shell; located on the right side of the staircase.
12. The elements in the 18th family on the Periodic Table; inert (full valence shells).
15. The elements in the 1st family on the Periodic Table; reactive with halogens and water, and have a charge of 1+.
17. An element that has a positive charge by losing electrons to get rid of the outer valence shell.
18. Atoms of the same element that have a different number of neutrons.
19. Elements with less than four electrons on the outer shell; located on the left side of the staircase.

1. The vertical rows of the Periodic Table, also known as families.
2. The elements in the 2nd family on the Periodic Table; reactive with halogens and oxygen, and have a charge of 2+.
3. An element that has lost or gained an electron.
5. The elements in the 17th family on the Periodic Table; like to gain an extra electron, so have a charge of 1-.
7. The part of an atom's nucleus that is positively charged, and is represented by the atomic number.
13. The number that is the sum of the protons and neutrons in an atom's nucleus.
14. The horizontal rows on the Periodic Table.
16. An element that has a negative charge by gaining electrons to fill it's outer valence shell.