$19$

An example of an excited state configuration

A$)($i$)$

$)($ii$)$

c$)($iii$)$

D$)($iv$)$

$($E$)(v)$

$20.$

AH corresponds to an

process.

A$)$ negative, endothermic

$($B$)$ negative, exothermic

$21.$

The reaction

$4Al(s)+3O_2(g)2A{l}_2{O}_3$

$($s$)$

$H=-3351kJ$

t$.$ and therefore heat is by the reaction.

C$)$ exothermic, released

B$)$ endothermic, absorbed

$22.$ An electron cannot have the quantum numbers $n=$

$($A$)6,1,0$

B$)3,2,3$

C$)3,2,-2$

D$)1,0,0$

E$)3,2,1$

$23.$ Which of the following is a valid set of four quantum numbers? $(n,l,\frac{m}{,}m{s}_S)$

A$)2,1,0,+\frac{1}{2}$

B$)2,2,1,-\frac{1}{2}$

C$)1,0,1,+\frac{1}{2}$

D$)2,1,+2,+\frac{1}{2}$

$24.$ The wavelength of light that has a frequency of $1\mathrm{.}20{10}^{13}{s}^{-1}$ is

A$)25\mathrm{.}0$

B$)2\mathrm{.}50{10}^{-5}$

C$)0\mathrm{.}0400$

D$)12\mathrm{.}0$

E$)2\mathrm{.}5$

$25.9s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^7$ is the correct electron configuration for which of the following atoms?

a$.B{r}^A$

$($b$)$ Con

c$.T_4$

d$.R_{hr}$

e$.$ Enone of thesen

$26.$ Visible light with a wavelength of $550nm$ has a frequency of Hz$.$

A$)5\mathrm{.}5105$

B$)1\mathrm{.}71011$

C$)5\mathrm{.}51014$

D$)1\mathrm{.}7{10}^2$

E$)5\mathrm{.}51017$

$27.$ The wavelength of a photon that has an energy of $5\mathrm{.}25{10}^{-19}J$ is

A$)3\mathrm{.}79{10}^{-7}$

B$)2\mathrm{.}64106$

C$)2\mathrm{.}381023$

D$)4\mathrm{.}21{10}^{-24}$

E$)3\mathrm{.}79{10}^7$

$28.$ What is the frequency $(s^{-1})$ of a photon that has an energy of $4\mathrm{.}38{10}^{-18}J?$

A$)436s^{-1}$

B$)6\mathrm{.}611015s^{-1}$

C$)1\mathrm{.}45{10}^{-16}{s}^{-1}$

D$)2\mathrm{.}30107s-1$

E$)1\mathrm{.}31{10}^{-9}{s}^{-1}$

The energy $(J)$ required for an electronic transition in a Bohr hydrogen atom from $n=2$ to $n=3$ is $J.$

A$)4\mathrm{.}0010-19$

B$)3\mathrm{.}0010-19$

C$)-3\mathrm{.}0010-19$

D$)-7\mathrm{.}9010-19$

E$)4\mathrm{.}601014$

Which of the following electron configurations is correct? $$

$($a$)Ga{*}^{cos}[Kr]4s^{2}3d^{10}4p^1$ r

$$

c$.{?}^{C}Ca{*}^{\text{@}000}[Ar]4s^{1}3d^{10}$

$.$

d$.B{r}^{\text{c}\text{o}\text{g}}[Kr]4s^{2}3d^{10}4p^7$

$$

e$.Bi{*}^{-oc}[xe]6s^{2}4f^{4}5d^{10}6p^{3}n$

$$

$.$