According to the octet rule, an
atom with two electron shells is most stable when it contains eight electrons. The
answer is letter B. All atoms wanted to attain a stable energy level equal to
that of the noble gases. A noble gas is where all valence electrons in the
valence shell is completely filled.
Answer:
M = 500 J
Explanation:
Given that,
Mass, M = 1000 g = 1 kg
Height, h = 10 m
Potential energy is given by :
P = mgh
P = 1×10×10
P = 100 J
The kinetic energy at ground = 400 J
Mechanical energy = sum of kinetic and potential energy
So,
M = 100 + 400
M = 500 J
So, the mechanical energy of the system is 500 J.
