Answer:
Question one is b, Question two is b, and question three is b, im pretty positive that what it is
151.9j
Explanation:
PE=1/2kx^2
PE=1/2(980)(.50)= 245j
PE=(1/2)(980)(.81)= 396.9j
396.9- 245= 151.9j
Answer:
The name of the highly Electropositive element goes first.
e.g

Chlorine is more Electropositive than Oxygen.
e.g

Nitrogen is more Electropositive than Oxygen