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### CHEMISTRY QUESTION POOL

1. The element \(A\) belongs to the second period and the \(17^{\text{th}}\) group, and the element \(B\) belongs to the third period and the second group of the periodic table. (Symbols shown are not real.)
a. Write the subshell electronic configuration of \(A\).
b. To which block does \(B\) belong? What is its valency?
c. Give the formula of the compound formed by \(A\) and \(B\).

2. Arrange the subshells in the correct order of electron filling:
[tex]\[
4s, 3d, 2p, 3s, 2s, 1s, 3p, 4p
\][/tex]

3. How many electrons can be accommodated in the \(f\) subshell?

4. Analyze the table and answer the questions:

[tex]\[
\begin{array}{|c|c|}
\hline
\text{Element (Symbols are not real)} & \text{Atomic number} \\
\hline
P & 11 \\
\hline
Q & 18 \\
\hline
R & 16 \\
\hline
S & 26 \\
\hline
\end{array}
\][/tex]

a. Which of the above is a first group element?
b. What is the valency of \(R\)?
c. Give the formula of the compound when \(P\) combines with \(R\).
d. Which of the above shows different oxidation states?

Sagot :

GinnyAnswer
Sure, let's go through each part of the question step-by-step:

### 1. The element \( A \) belongs to the second period and 17th group, and element \( B \) belongs to the third period and second group of the periodic table.

a. Write the subshell electronic configuration of \( A \).

Since \( A \) is in the second period and 17th group, it is Fluorine (F) with an atomic number of 9. The electronic configuration of Fluorine is:
[tex]\[ \text{1s}^2 \, 2\text{s}^2 \, 2\text{p}^5 \][/tex]

b. To which block does \( B \) belong? What is its valency?

Element \( B \) is in the third period and second group, which identifies it as Magnesium (Mg) with an atomic number of 12. Magnesium belongs to the s-block and its typical valency is +2.

c. Give the formula of the compound formed by \( A \) and \( B \).

The compound formed when Magnesium (Mg) and Fluorine (F) combine is magnesium fluoride, which has the chemical formula:
[tex]\[ \text{MgF}_2 \][/tex]

### 2. Arrange the subshells in the correct order of electron filling:
Given subshells: \(\text{4s, 3d, 2p, 3s, 2s, 1s, 3p, 4p}\)

The correct order of electron filling according to the Aufbau principle and Hund's rule is:
[tex]\[ \text{1s}, \, \text{2s}, \, \text{2p}, \, \text{3s}, \, \text{3p}, \, \text{4s}, \, \text{3d}, \, \text{4p} \][/tex]

### 3. How many electrons can be accommodated in the \( f \) subshell?

The f subshell can accommodate a maximum of:
[tex]\[ 14 \text{ electrons} \][/tex]

### 4. Analyze the table and answer the questions.
[tex]\[ \begin{array}{|c|c|} \hline \text{Element (Symbols are not real)} & \text{Atomic number} \\ \hline P & 11 \\ \hline Q & 18 \\ \hline R & 16 \\ \hline S & 26 \\ \hline \end{array} \][/tex]

a. Which of the above is a first group element?

Element \( P \) has an atomic number of 11, which is Sodium (Na). Sodium is in the first group of the periodic table.

b. What is the valency of \( R \)?

Element \( R \) has an atomic number of 16, which is Sulfur (S). Sulfur commonly exhibits a valency of -2.

c. Give the formula of the compound when \( P \) combines with \( R \).

When Sodium (Na) combines with Sulfur (S), the compound formed is sodium sulfide, with the chemical formula:
[tex]\[ \text{Na}_2\text{S} \][/tex]

d. Which of the above shows different oxidation states?

Element [tex]\( S \)[/tex] has an atomic number of 26, which is Iron (Fe). Iron exhibits various oxidation states, most commonly +2 and +3.
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