In a period, elements are arranged in strict sequence of

Options

A. Decreasing charges in the nucleus
B. Increasing charges in the nucleus
C. Constant charges in the nucleus
D. Equal charges in the nucleus

Answer

**Step-by-step Solution:**

1. **Understanding the Periodic Table**: The periodic table is organized into periods (horizontal rows) and groups (vertical columns). Each period contains elements that have the same number of electron shells.

2. **Definition of a Period**: A period in the periodic table refers to a horizontal row of elements. As you move from left to right across a period, the properties of the elements change in a predictable manner.

3. **Arrangement of Elements**: In a period, elements are arranged in a strict sequence based on their atomic number, which is the number of protons in the nucleus of an atom.

4. **Increasing Nuclear Charge**: As you move across a period from left to right, the atomic number increases. This means that the number of protons (and therefore the positive charge in the nucleus) also increases.

5. **Effect of Increasing Nuclear Charge**: The increasing positive charge in the nucleus affects the electrons surrounding the nucleus. It leads to a stronger attraction between the nucleus and the electrons, which results in a decrease in atomic radius across the period.

6. **Conclusion**: Therefore, the correct answer to the question is that in a period, elements are arranged in strict sequence of **increasing charges in the nucleus**.

**Final Answer**: In a period, elements are arranged in strict sequence of increasing charges in the nucleus.

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