Answer:
elements in the same periodic table group have the same valence electrons
Answer:

Explanation:
Given data

Required
Partial pressure of helium
Solution
First calculate the total volume of gas mixture once the stopcock is opened
So

As temperature remains constant,by Boyle's Law we calculate the partial pressure of the helium gas
So

It produces Heat Energy that can be used to drive steam turbines to generate Electricity.
Answer:
It’s 7 hours
Explanation:
You have to use the formula your teacher has given to you plug in the numbers then solve be sure to use a calculator made for physics it helps a lot :)
Answer: Trough
Explanation: The point labeled C in the wave diagram above is the TROUGH of the wave motion. The trough of a wave motion identifies or signifies the point of least or minimum Displacement by measuring the downward Displacement of the wave. The point A is the CREST which is the opposite of the trough, signifying the point of maximum or upward Displacement of the wave cycle.
Point B is the wave amplitude which signifies the maximum extent of vibration from the equilibrium position of a wave. The point labeled D refers to the wavength of the wave motion which is the distance between successive crest or troughs of a wave motion.