Question 1

Which of the following shows the correct order of filling electron orbitals within the 5th energy level according to the Aufbau principle?

Accepted Answer

$$5s \rightarrow 4d \rightarrow 5p \rightarrow 6s \rightarrow 4f$$

Question 2

Which of the following sets of quantum numbers is not allowed?

Accepted Answer

$$n = 2, \ l = 2, \ m_l = 0, \ m_s = +\frac{1}{2}$$

Question 3

What is the maximum number of electrons that may reside in the 3rd energy level ($$n=3$$)?

Accepted Answer

$$18$$

Question 4

Which of the following is the correct electron configuration for the element sulfur (S, $$Z=16$$)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^4$$

Question 5

Which of the following ions is isoelectronic with argon ($$Ar$$)?

Accepted Answer

$$K^+$$

Question 6

Which of the following elements has the largest atomic radius?

Accepted Answer

$$K$$

Question 7

The radius of a cation is always ______ the radius of the corresponding neutral atom.

Accepted Answer

less than

Question 8

List the elements C, Al, N, Na, and Ar in the order of decreasing first ionization energy.

Accepted Answer

$$Ar \u003e N \u003e C \u003e Al \u003e Na$$

Question 9

Which of the following processes requires the largest amount of energy?

Accepted Answer

$$Mg^+ (g) \rightarrow Mg$$^{2+}$$ (g) + e^-$$

Question 10

The ionic radius of $$Na^+$$ ion is ______ than that of $$Na$$ atom and ______ than that of $$F^-$$ ion.

Accepted Answer

smaller; smaller

Question 11

Rank the following elements in order of increasing electronegativity: C, Al, S, O, Cl.

Accepted Answer

$$Al \u003c C \u003c S \u003c O \u003c Cl$$

Question 12

Which of the following molecules has a trigonal planar shape?

Accepted Answer

$$BF_3$$

Question 13

What is the hybridization of the central atom in $$BeF_2$$ molecule?

Accepted Answer

$$sp$$

Question 14

What is the basic electron domain geometry for a molecule with a total of 5 electron domains?

Accepted Answer

trigonal bipyramidal

Question 15

Which of the following statements best describes the bonding in $$CO_2$$?

Accepted Answer

Each oxygen forms a double bond with carbon, resulting in a linear molecule.

Question 16

Which of the following molecules has the central atom that does NOT obey the octet rule?

Accepted Answer

$$BF_3$$

Question 17

The electronegativity of element A is 3.0 and that of element B is 2.1. The binary compound AB will be best described as:

Accepted Answer

covalent with polar bonds, A–B, where A has a partial negative charge and B has a partial positive charge

Question 18

What is the geometry of a $$sp^3-$$hybridized atom?

Accepted Answer

tetrahedral

Question 19

Which of the following elements cannot form expanded valence shells (exceed the octet)?

Accepted Answer

$$N$$

Question 20

Which of the following bonds is the most polar and the least ionic covalent bond?

Accepted Answer

$$N-F$$

General Chemistry Study Guide: Electronic Structure, Periodic Properties, Chemical Bonding, and Molecular Geometry

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