Question 1

Which of the following is the correct ground state electron configuration for calcium (Ca)?

Accepted Answer

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

Question 2

Which abbreviated electron configuration correctly represents titanium (Ti)?

Accepted Answer

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

Question 3

Which of the following ions is diamagnetic?

Accepted Answer

$$Al^{3+}$$

Question 4

Given the following electron configurations, which one corresponds to a paramagnetic atom?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^5$$

Question 5

Which atom has the largest atomic radius among the following?

Accepted Answer

$$Mg$$

Question 6

Calculate the effective nuclear charge ($$Z_{eff}) $$for a valence electron in phosphorus ($$P$$), given $$Z = 15$$ and $$S = 10. $$Use the formula $$Z_{eff} = Z - S.$$

Accepted Answer

$$Z_{eff} = 5$$

Question 7

Rank the following elements in order of increasing first ionization energy: $$Li$$, $$Na$$, $$K$$, $$Rb.$$

Accepted Answer

$$Rb \u003c K \u003c Na \u003c Li$$

Question 8

Which of the following ions has the smallest ionic radius?

Accepted Answer

$$Al^{3+}$$

Question 9

Which of the following is the correct ground state electron configuration for $$Zn^{2+}$$?

Accepted Answer

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

Question 10

Given the following ionization energies for $$Na$$: $$496$$, $$4562$$, $$6912 kJ/$$mol, what is the most likely charge of a stable sodium ion?

Accepted Answer

$$+1$$

Question 11

Which of the following elements has the highest first ionization energy?

Accepted Answer

$$Ne$$

Question 12

Which of the following atoms or ions is paramagnetic?

Accepted Answer

$$Al$$

Question 13

Which of the following is the correct orbital diagram for phosphorus ($$P$$)?

Accepted Answer

Three unpaired electrons in the $$3p$$ orbitals

Question 14

Which of the following ions has the largest radius?

Accepted Answer

$$Cl^{-}$$

Question 15

Which element has the electron configuration $$[Ne]\ 3s^2$\ 3p^4$?

Accepted Answer

$$S$$

Question 16

Which of the following atoms has the greatest effective nuclear charge for its valence electrons?

Accepted Answer

$$Si$$

Question 17

Which of the following ions is isoelectronic with $$Ne$$?

Accepted Answer

$$O^{2-}$$

Question 18

Which of the following elements has the lowest first ionization energy?

Accepted Answer

$$K$$

Question 19

Which of the following ions has the same number of electrons as $$Mg^{2+}$$?

Accepted Answer

$$O^{2-}$$

Question 20

Arrange the following ions in order of increasing radius: $$Ca^{2+}$$, $$K^{+}$$, $$S^{2-}$$, $$Cl^{-}.$$

Accepted Answer

$$Ca^{2+}$$ \u003c $$K^{+}$$ \u003c $$Cl^{-}$$ \u003c $$S^{2-}$$

Chapter 3 Study Notes: Electron Configuration, Orbital Diagrams, and Periodic Properties

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