1. Who is Henry Mosley? 2. What did Henry Mosley contribute to the Periodic Table and science?
3. What are the 4 periodic table trends?
4. Define each periodic table trend?
5. What is the molar mass of the following compounds (you need the periodic table): NaCl, MgO, CuO
6. Solve 30 g of NaCl Liters (Hint 1 mole = 22.4 L and you MUST convert from grams to moles)
7. Solve 3.5 moles molecules
8. Solve 300 molecules moles
9. What is an isotope? Explain + Give me 1 example.
10. What is an ion? What subatomic particle does an ion effect?

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

16

explanation:

the marks go by 4s