Question 1

Which of the following best describes the order in which electron subshells are filled according to the Aufbau principle, as illustrated in the diagram provided?

Accepted Answer

$$1s \rightarrow 2s \rightarrow 2p \rightarrow 3s \rightarrow 3p \rightarrow 4s \rightarrow 3d \rightarrow 4p$$

Question 2

Based on the periodic table provided, which element is located in period 3, group 2?

Accepted Answer

Magnesium (Mg)

Question 3

Which subshell can hold a maximum of 14 electrons, as shown in the electron filling diagram?

Accepted Answer

$$f$$ subshell

Question 4

According to the periodic table, which group contains elements that are all gases at room temperature?

Accepted Answer

Group 18 (Noble gases)

Question 5

Which of the following electron configurations represents a transition metal?

Accepted Answer

$$[Ar] 4s^2$ 3d^6$

Question 6

Using the periodic table, which element has the electron configuration $$[Ne] 3s^2$ 3p^4$?

Accepted Answer

Sulfur (S)

Question 7

Which of the following statements about the $$d$$ block elements is correct based on the periodic table?

Accepted Answer

They are all metals and are known as transition elements.

Question 8

According to the electron filling diagram, which subshell is filled immediately after $$4s$$?

Accepted Answer

$$3d$$

Question 9

Which element is expected to have the highest first ionization energy based on its position in the periodic table?

Accepted Answer

Neon (Ne)

Question 10

A neutral atom of which element has the electron configuration $$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$ $$3p^1$$?

Accepted Answer

Aluminum (Al)

Question 11

Which of the following best explains why the $$4s$$ orbital is filled before the $$3d$$ orbital?

Accepted Answer

The $$4s$$ orbital is lower in energy than the $$3d$$ orbital.

Question 12

Based on the periodic table, which element is a metalloid?

Accepted Answer

Silicon (Si)

Question 13

Which of the following elements has its valence electrons in the $$5p$$ subshell?

Accepted Answer

Iodine (I)

Question 14

How many electrons are needed to fill the $$3p$$ subshell completely?

Accepted Answer

$$6$$

Question 15

Which element is located in period 4, group 17 of the periodic table?

Accepted Answer

Bromine (Br)

Question 16

Which of the following is the correct electron configuration for a neutral phosphorus atom?

Accepted Answer

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

Question 17

Which block of the periodic table contains the lanthanides and actinides?

Accepted Answer

$$f$$ block

Question 18

Which of the following elements has the greatest number of valence electrons?

Accepted Answer

Argon (Ar)

Question 19

Which of the following statements is true regarding the periodic trend for atomic radius?

Accepted Answer

Atomic radius increases down a group and decreases across a period.

Question 20

Which element would have the electron configuration ending in $$4d^{10}$$ $$5s^2$$ $$5p^2$$?

Accepted Answer

Tin (Sn)

Intro to Chemistry Final Exam Study Guidance

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