Option C, decreases as you move from left to right across a period
As you move from left to right across a period, the atoms get more and more protons. These protons pull on the electrons, making the atoms progressively smaller and smaller because of the increasing pull.
Atomic size generally increases as you move from top to bottom within a group due to increase in the principal quantum number. However, atomic size generally decreases as you move from left to right across a period, as the added protons and electrons increase the effective nuclear charge and pull the electrons in closer.
In the context of atomic size on the periodic table, there are two primary trends to notice: Atomic size generally decreases as you move from left to right across a period. This happens because as we move from left to right, we add a proton to the nucleus and an electron to the valence shell with each successive element, thereby increasing the effective nuclear charge and pulling the electrons in tighter to the nucleus.
Atomic size generally increases as you move from top to bottom within a group. This is due to the increase in the principal quantum number, causing the atomic radius to grow as there are more electron shells.
These observations come from understanding the electronic structure of elements and how they influence the properties like atomic size, ionization energies and electron affinities that vary periodically as the electronic structure of the elements changes.
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Answer:
= 25 g
Explanation:
Using the formula;
A = A₀ (1/2)^(t/h)
where A is the final amount,
A₀ is the initial amount of the substance,
t is the time and
h is the half-life of the substance,
In this case; the half life of U-238 h is equal to 4.47 billion years.
A = A₀ (1/2)^(t/h)
A = 50 (1/2)^(4.5 / 4.47)
= 24.88
= 25 g
Answer:
C) 25 grams
Explanation:
25 grams would remain after one half-life (4.5 billion years). Find the point where percent remaining is 50% and that will tell you it is one half-life.
Biotic components are the living components of an ecosystem. The biotic factor that limits the carrying capacity of any habitat is activity of decomposers, i.e., option B.
The organisms that usually feed on dead and decaying organisms and whose digestion is external one are called as decomposers.
The bioticfactor that limits the carryingcapacity of any habitat is activity of decomposers.
Thus, the correct option is B.
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The ways scientists do investigations is observational studies, surveys and questionnaires and case studies,
Scientists use various methods to conduct investigations and explore the natural world. These methods include:
1. Observational Studies: Scientists carefully observe and record natural phenomena or events without intervening or manipulating the environment. Observational studies are often used in fields such as astronomy, ecology, and anthropology.
2. Experimental Studies: Scientists design controlled experiments to test specific hypotheses or investigate cause-and-effect relationships. In experiments, variables are manipulated and controlled to observe their impact on the outcome. This method is common in chemistry, physics, and biology.
3. Surveys and Questionnaires: Researchers use surveys and questionnaires to gather data from a large number of individuals to assess opinions, attitudes, behaviors, or preferences. This method is prevalent in social sciences and market research.
4. Case Studies: In-depth investigations of a particular individual, group, or situation are conducted to gain detailed insights. Case studies are commonly used in psychology, medicine, and sociology.
5. Field Studies: Scientists conduct research directly in the natural environment, collecting data in real-world settings. Field studies are common in geology, environmental science, and wildlife biology.
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D. A liquid becoming gas
Particles in a solid state can only vibrate. In a liquid state, they slide against each other. And in a gas state, they move freely, bouncing and bumping into each other.