$5.$ Below are listed the atomic weight, density and lattice parameter for two hypothetical alloys. For ach determine whether its crystal structure is FCC$,$ BCC$,$ SC $($Simple Cubic$)$ and then justify your determination.

$\backslash$begin$\{$tabular$\}\{|$c$|$c$|$c$|$c$|\}$

$\backslash$hline Alloy & Atomic mass $(\backslash (\backslash$mathrm$\{$g$\}/\backslash$mathrm$\{$mol$\}\backslash ))$ & Density $($g$/$cm $\backslash (\{\}^\{3\}\backslash ))$ & Atomic Radius $($nm$)\backslash \backslash$

$\backslash$hline A & $77,4$ & $10,69$ & $0,125\backslash \backslash$

$\backslash$hline B & $107,6$ & $9,49$ & $0,133\backslash \backslash$

$\backslash$hline C & $127,3$ & $13,0$ & $0,142\backslash \backslash$

$\backslash$hline

$\backslash$end$\{$tabular$\}$