The mass of $-1\mathrm{.}63{10}^{21}$ silicon atoms is:

A$)2\mathrm{.}71{10}^{-23}g$

B$)4\mathrm{.}58{10}^{22}g$

C$.28\mathrm{.}08g$

D$)2\mathrm{.}60{10}^{-2}g$

What is the energy in joules of one photon of microwave with the wavelength $0\mathrm{.}122m$ :

A$)2\mathrm{.}70{10}^{-34}J$

B$)4\mathrm{.}07\frac{10}{b}ar(10)$

C$)5\mathrm{.}43{10}^{-33}J$

D$)1\mathrm{.}63{10}^{-24}J$

What iq wavelength of radiation that has a frequency $5\mathrm{.}39{10}^{H}HZ$ :

A$)1\mathrm{.}80{10}^{\frac{-}{b}ar(3)}nm$

B$)556nm$

C$.618nm$

D$)6180nm$

Which of the following is the electron configuration for the bromide ion Br :

A$)$ IArI

B$)$ IXeI

C$)$ IKrI

D$)$ IArI $4s^{2}3d^{10}4p^7$

The electron configuration of a ground$-$state co atom is :

A$)$ IArI $4{}^{2}4d^7$

B$)$ IArI $4s^{2}3d^7$

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C$)1s^{2}2s^{2}2p^{6}3s^{2}3d^9$

D$)$ IArI$4{}^{1}3d^8$