Question 1

Which quantum number is responsible for the two possible orientations of electron spin observed in the Stern-Gerlach experiment, as shown in the first image?

Accepted Answer

Spin quantum number ($$m_s)$$

Question 2

According to the Aufbau principle and the order shown in the second image, which subshell is filled immediately after $$4s$$?

Accepted Answer

$$3d$$

Question 3

Which of the following electron configurations represents the ground state of phosphorus (P), as shown in the third image?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$ $$3p^3$$

Question 4

Based on the periodic table block diagram (fourth image), which block contains the transition metals?

Accepted Answer

d-block

Question 5

Which of the following orbital diagrams (sixth image) correctly represents the ground state of a carbon atom according to Hund’s rule?

Accepted Answer

Diagram 1

Question 6

Which of the following electron configurations is NOT allowed by the Pauli exclusion principle?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^8$$

Question 7

Which element has the largest atomic radius among Br, Se, and Te, as shown in the periodic trend images?

Accepted Answer

Te

Question 8

Refer to the ionization energy graph (thirteenth image). Which element has the highest first ionization energy?

Accepted Answer

Helium (He)

Question 9

Which of the following ions is smallest in size, based on the isoelectronic series and periodic trends?

Accepted Answer

$$Mg^{2+}$$

Question 10

Which of the following statements best explains why cations are smaller than their parent atoms, as shown in the sixteenth image?

Accepted Answer

Cations have more protons than electrons, increasing nuclear attraction.

Question 11

Which of the following elements is most likely to form an amphoteric oxide?

Accepted Answer

Aluminum (Al)

Question 12

Which of the following ions has the same electron configuration as argon ($$[Ne]3s^2$ 3p^6$)?

Accepted Answer

$$K^+$$

Question 13

Which of the following elements has the highest metallic character?

Accepted Answer

Cesium (Cs)

Question 14

Which of the following best describes a paramagnetic atom?

Accepted Answer

An atom with one or more unpaired electrons

Question 15

Which of the following electron configurations represents a transition metal ion in its most common oxidation state?

Accepted Answer

$$[Ar]3d^6$

Question 16

Which of the following elements is a metalloid that forms an acidic oxide with the formula $$R_2O_5$$?

Accepted Answer

Arsenic (As)

Question 17

Which of the following best explains the trend in atomic radius across a period?

Accepted Answer

Atomic radius decreases due to increased effective nuclear charge.

Question 18

Which of the following electron configurations is most likely to be observed for a stable ion of zinc?

Accepted Answer

$$[Ar]3d$$^{10}$$

Question 19

Which of the following best describes the electron affinity trend across a period?

Accepted Answer

Electron affinity becomes more negative from left to right.

Question 20

Which of the following ions is isoelectronic with neon?

Accepted Answer

$$Na^+$$

Periodic Properties of the Elements: Electronic Structure, Periodicity, and Trends

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