Q: Which of the following electron configurations violates Hund's Rule?

$$\begin{array}{c}\text{1s}\ \uparrow\downarrow\ \text{2s}\ \uparrow\downarrow\ \text{2p}\ \uparrow\downarrow\ \uparrow\ \uparrow\end{array}$$

Q: Which electron configuration represents a violation of the Aufbau Principle?

$$\text{1s}^2\ \text{2s}^2\ \text{3s}^2\ \text{2p}^6$$

Q: A charge of $$+4.13 \times 10$$^{-19}$$\ \mathrm{C} is $$placed $$8.03 \times 10$$^{-9}$$\ \mathrm{m}$$ apart from another charge of $$-3.37 \times 10$$^{-17}$$\ \mathrm{C}. $$What is the force of attraction between the charged particles? (Use $$E = e \frac{Q_1$ Q_2$}{r^2$}$$, $$e = 8.99 \times 10^9$\ \mathrm{N\cdot m^2$/C^2$$}$)

$$1.94 \times 10$$^{-16}$$\ \mathrm{N}$$

Question 1

Which of the following electron configurations violates Hund's Rule?

Accepted Answer

$$\begin{array}{c}	ext{1s}\ \uparrow\downarrow\ 	ext{2s}\ \uparrow\downarrow\ 	ext{2p}\ \uparrow\downarrow\ \uparrow\ \uparrow\end{array}$$

Question 2

Which electron configuration represents a violation of the Aufbau Principle?

Accepted Answer

$$	ext{1s}^2\ 	ext{2s}^2\ 	ext{3s}^2\ 	ext{2p}^6$$

Question 3

Which element has the following electron configuration: $$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^5$$?

Accepted Answer

Chlorine

Question 4

What is the condensed electron configuration for zinc (Zn, $$Z=30$$)?

Accepted Answer

$$[Ar]\ 4s^2$\ 3d$$^{10}$$

Question 5

Which of the following is the correct electron configuration for gold (Au, $$Z=79$$)?

Accepted Answer

$$[Xe]\ 6s^1$\ 4f$$^{14}$$\ 5d$$^{10}$$

Question 6

Which of the following atoms is paramagnetic?

Accepted Answer

Oxygen ($$1s^2$$\ $$2s^2$$\ $$2p^4)$$

Question 7

Which of the following elements has the most unpaired electrons in its ground state?

Accepted Answer

Manganese (Mn)

Question 8

What is the full electron configuration for the selenide ion ($$Se^{2-}$$, $$Z=34$$)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^6$$\ $$4s^2$$\ $$3d^{10}$$\ $$4p^6$$

Question 9

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

Accepted Answer

$$Cl^-$$

Question 10

Which of the following best explains why chromium ($$Z=24) $$has the electron configuration $$[Ar]\ 4s^1$\ 3d^5$ instead of $$[Ar]\ $$4s^2$$\ $$3d^4$$?

Accepted Answer

Because a half-filled $$d$$ subshell is more stable due to exchange energy and symmetry.

Question 11

Which of the following ions has the electron configuration $$[Ar]\ 3d^6$?

Accepted Answer

$$Fe^{2+}$$

Question 12

A charge of $$+4.13 	imes 10$$^{-19}$$\ \mathrm{C} is $$placed $$8.03 	imes 10$$^{-9}$$\ \mathrm{m}$$ apart from another charge of $$-3.37 	imes 10$$^{-17}$$\ \mathrm{C}. $$What is the force of attraction between the charged particles? (Use $$E = e \frac{Q_1$ Q_2$}{r^2$}$$, $$e = 8.99 	imes 10^9$\ \mathrm{N\cdot m^2$/C^2$$}$)

Accepted Answer

$$1.94 	imes 10$$^{-16}$$\ \mathrm{N}$$

Question 13

Which of the following statements about paramagnetism and diamagnetism is correct?

Accepted Answer

A diamagnetic atom has all electrons paired and is not attracted to a magnetic field.

Question 14

Which of the following ions has the same electron configuration as krypton ($$Kr$$)?

Accepted Answer

$$Br^-$$

Question 15

Which of the following is the correct condensed electron configuration for the silver ion ($$Ag^+$$, $$Z=47$$)?

Accepted Answer

$$[Kr]\ 4d$$^{10}$$

Question 16

Which of the following best describes the order in which electrons fill orbitals according to the Aufbau Principle?

Accepted Answer

Electrons fill the lowest available energy orbitals before filling higher energy orbitals.

Question 17

Which of the following elements would you expect to have the highest first ionization energy?

Accepted Answer

Fluorine

Question 18

Which of the following is the correct condensed electron configuration for the titanium (III) ion ($$Ti^{3+}$$, $$Z=22$$)?

Accepted Answer

$$[Ar]\ 3d^1$

Question 19

Which of the following best explains why $$4s$$ electrons are removed before $$3d$$ electrons when forming cations of transition metals?

Accepted Answer

After filling, $$4s$$ electrons are higher in energy than $$3d$$ electrons and are removed first.

Electron Configurations, Orbital Diagrams, and Coulomb's Law: General Chemistry Study Notes

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