Question

question 6
1 pts
which of the following elements is in the same period as ca?
○ k
○ cl
○ mg
○ br
question 7
1 pts
what do the noble gases in group 18 have in common?
○ sought after by kings
○ similar chemical properties
○ flammable gases
○ used in crowns and scepters

Explanation:

For Question 6: Periods in the periodic table are horizontal rows. Carbon (C) is in period 2. Magnesium (Mg) is in period 3, Chlorine (Cl) is in period 3, Molybdenum (Mo) is in period 5, and Boron (B) is in period 2.
For Question 7: Noble gases in group 18 have similar chemical properties because they have a full outer - electron shell, making them very stable and unreactive.

Answer:

Question 6: B. B
Question 7: B. similar chemical properties