Question

question 7
elements in group ____ are known as the noble gases and they ____ (do/do not) react with other elements
blank 1:
blank 2:

question 8
rank the following from lowest ionization energy to highest

1 ag

2 n

3 sr

4 al

Explanation:

• Noble Gases are in group 18 (or 8A in some notations) of the periodic table. They have full valence electron shells, which makes them very stable and unreactive.
• Ionization energy generally increases across a period (from left to right) and decreases down a group. Ag (Silver) is a transition metal in period 5. N (Nitrogen) is in period 2, group 15. Sr (Strontium) is in period 5, group 2. Al (Aluminum) is in period 3, group 13. Sr, being an alkaline earth metal in a lower period (but considering the trends), has relatively low ionization energy. Ag, as a transition metal, has lower ionization energy than N and Al. Al has lower ionization energy than N.

Answer:

Question 7:
Blank 1: 18 (or 8A)
Blank 2: do not
Question 8: Sr < Ag < Al < N