Question

energy the strength and vitality required for sustained physical or mental activity

• the sun is in the _. it is a pretty young star, fusing _ into _ and releasing energy.
• it will become a red giant when the hydrogen is mostly fused and its main fuel source is _
• eventually the sun will die when all of the helium fuses in to _ and no more energy is released.

fusion
h
proton
neutron
h
proton
neutron
total
protons
neutrons
he
protons
neutrons
the number of protons an neutrons _ but the atoms have changed from _ to _.

Explanation:

Step1: Identify the life - cycle stage of the Sun

The Sun is in the main - sequence stage. It fuses hydrogen into helium.

Step2: Determine the state when hydrogen is mostly fused

When hydrogen is mostly fused, its main fuel source is depleted and it will become a red giant.

Step3: Identify the end - state of the Sun

When all helium fuses into carbon (in the case of a star like the Sun), no more energy is released and the Sun will die.

Step4: Analyze the fusion diagram

Two hydrogen atoms (each with 1 proton and 1 neutron) fuse. The total number of protons is 2 and the total number of neutrons is 2. The atoms change from hydrogen to helium.

Answer:

• The Sun is in the main - sequence. It is fusing hydrogen into helium. When hydrogen is mostly fused and its main fuel source is depleted, it will become a red giant. Eventually, when all of the helium fuses into carbon and no more energy is released, the Sun will die. In the fusion diagram, there are 2 total protons and 2 total neutrons, and the atoms have changed from hydrogen to helium.