Question

1. what element does a star fuse after the hydrogen is depleted?
2. what is the last element made during the fusion reaction in red giant and super red giant stars?
3. the sun is what type of star? how can you tell?
4. element emission patterns:

Explanation:

1. After hydrogen is depleted in a star, it fuses helium. This is because once hydrogen - burning in the core stops, the core contracts and heats up enough to start helium - fusion.
2. The last element made during fusion in red giant and super - red giant stars is iron. Fusion reactions release energy until iron is formed. Beyond iron, fusion requires more energy than it releases.
3. The Sun is a main - sequence star. We can tell because it is in a stable phase of its life cycle, fusing hydrogen into helium in its core through the proton - proton chain reaction and has a relatively stable luminosity and temperature.
4. Element emission patterns refer to the unique set of wavelengths of light that an element emits when its atoms are excited. Each element has a characteristic emission spectrum which can be used to identify the element, similar to a fingerprint.

Answer:

1. Helium
2. Iron
3. Main - sequence star; It is in a stable phase fusing hydrogen into helium via the proton - proton chain reaction with a stable luminosity and temperature.
4. Unique set of wavelengths of light an element emits when its atoms are excited, used for element identification.