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QR Challenge: Periodic Table and Trends Scavenger Hunt

Question	Answer
1. When elements are arranged in order of increasing atomic number, there is a repeating pattern of their chemical and physical properties.	Periodic Law
2. What happens to the number of valence electrons as you go down a group?	Number of valence electrons stays the same.
3. What happens to the number of valence electrons as you go across a period?	Number of valence electrons increases.
4. The tendency of an atom to attract electrons to form an ionic bond.	Electronegativity
5. The size of an atom	Atomic radius
6. Energy required to remove an electron from a neutral atom.	Ionization energy
7. The trend in ionization energy and electronegativity as you go down a group and why this occurs.	Decreases as you go down a group because electrons are close to the nucleus in smaller atoms making the attraction stronger.
8. The trend in ionization energy and electronegativity as you go across a period and why this occurs.	Increases to the right because electrons are held more tightly because of an increased charge.
9. The trend in atomic radius as you go down a group and why this occurs.	Increases as you go down a group because higher energy levels have larger orbitals so the size of atom increases.
10. The most reactive nonmetal.	Fluorine
11. The trend in atomic radius as you go across a period and why this occurs.	Increases to the left because electrons are held more loosely.
12. The most reactive metal.	Francium