Question

1. what is it called when bacteria in the soil convert nitrogen in the air into ammonia in the soil?
2. what is biodiversity?
3. what is the rainbow trouts role in the ecosystem?
4. what is an ecosystem?
5. what are fish?
6. how many sides does a snowflake have?
7. research - what two elements make up table salt?
8. research - how does atomic mass relate to the size of the atom?
9. research - as you move from left to right across a period on the periodic table, how does size change?
10. research -as you move from top to bottom in a group, how does the size of an atom change?
11. what is the atomic number of iron?
12. what is the atomic mass of iron?
13. know how to identify an atom by its period and group. for example, iron is group 8 & period 4.

Explanation:

1. This is a key nitrogen cycle process where soil bacteria fix atmospheric N₂.
2. It refers to the variety of all living organisms on Earth.
3. Rainbow trout are secondary/tertiary consumers, controlling prey populations.
4. It is a community of organisms interacting with their physical environment.
5. Fish are aquatic, gill-breathing vertebrates with fins.
6. Snowflakes are hexagonal, so they have 6 sides.
7. Table salt is a ionic compound of two common elements.
8. Atomic mass depends on protons/neutrons; larger atoms often have higher mass, but not always due to isotopes.
9. Increasing nuclear charge pulls electrons closer, reducing atomic radius.
10. New electron shells are added, increasing atomic radius.
11. It is the number of protons in an atom's nucleus, unique to each element.
12. The average atomic mass of iron accounts for its isotopes.
13. Periods are horizontal rows, groups are vertical columns on the periodic table.

Answer:

1. Nitrogen fixation
2. Biodiversity is the variety of all living organisms (including species, genetic, and ecosystem diversity) on Earth.
3. Rainbow trout are predatory consumers (secondary or tertiary consumers) that control populations of smaller aquatic organisms, transfer energy up the food web, and act as prey for larger predators.
4. An ecosystem is a biological community of interacting organisms and their physical (abiotic) environment.
5. Fish are aquatic, craniate, gill-bearing vertebrates that lack limbs with digits, and most are ectothermic.
6. 6
7. Sodium (Na) and Chlorine (Cl)
8. Generally, larger atoms have higher atomic mass, but this is not a strict rule because atomic mass is the sum of protons and neutrons, and some smaller atoms may have more neutrons (isotopes) than larger atoms.
9. Atomic size (atomic radius) decreases from left to right across a period.
10. Atomic size (atomic radius) increases from top to bottom within a group.
11. The atomic number is the number of protons in the nucleus of an atom, which defines the identity of an element.
12. 55.845 u (unified atomic mass units)
13. To identify an atom by period and group: Locate the horizontal row (period) and vertical column (group) on the periodic table. For example, Iron (Fe) is in Period 4 (4th horizontal row) and Group 8 (8th vertical column).