Answer:
Br
Explanation:
Ionization energy increases across a period.
All other elements are ahead in the period as compared to Br.
Energy can make matter do all of the above, so D
Answer:
2.05 liters
Calculate the molar mass of Ca(OH)2 =74.09g/mol
Calculate how many mol of Ca(OH) are in 64g
n=m/MM
n=64/74.09
n=0.86 mol
Calculate the volume of solution
M=n/V => V=n/M
V= 0.86 mol/ 0.420M
V= 2.05 liters
Group 6 elements like Oxygen like to take on the extra two electrons to become a 2- anion and take on the noble gas configuration. so the O^2-, which looks like O=O, will have two oxygens sharing two electrons.... answer is O^2-
