| Across |
| 4. |
Elements in the same ____________ usually have the same number of valence electrons |
| 6. |
An inert gas of group 18 |
| 8. |
An non-metal element of group 17 that can pair up with an alkali or alkaline earth metal to form a salt |
| 10. |
These types of metals include aluminum, tin, and lead |
| 14. |
It is equal to the number of protons plus the number of neutrons in the nucleus of an atom |
| 16. |
Elements of group 2 that are reactive, but not as reactive as alkali metals |
| 17. |
A metal of group 1 that is highly reactive |
| 18. |
A semimetal that acts as a semiconductor |
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|
| Down |
| 1. |
The conductive elements of groups 3-12 that are hard, malleable, and shiny |
| 2. |
Lanthanides and actinides |
| 3. |
A version of an element that has the same number of protons but a different number of neutrons |
| 5. |
A horizontal row of the periodic table |
| 7. |
It is the mass of an atom of a chemical element and is expressed in atomic mass units (amu) |
| 9. |
The radioactive elements of the inner transition metals |
| 11. |
It is equal to the number of protons in the nucleus of an atom and determines the identity and chemical properties of an atom |
| 12. |
Hydrogen, carbon, nitrogen, and oxygen can all be classified as ______________ |
| 13. |
The number of these particles in an atom's nucleus is found by subtracting atomic number from mass number |
| 15. |
An element in the top row of the inner transition metals |
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