Write the electronic configurations of the following atoms and ions, using (a) s

Question

Write the electronic configurations of the following atoms and ions, using

(a) s, p, d, f notation, and (b) [noble gas] + s, p, d, f notation:

Si, Ca2+, Fe, Cu, Zn2+, As, Y, Ag+, I-, La.

Determine the weight percent of carbon in the iron carbide Fe3C.

The only single-element material having a simple cubic crystal structure is polonium. (a) What is the weight of its unit cell?

(b) Consider a Po crystal with a mass of 1 g. How many atoms does it contain?

(c) Do we need to know the type of Po crystal structure to answer the questions (a) and (b)?

Explanation / Answer

a.)

Si(14) = 1s2 2s2 2p6 3s2 3p2

Ca2+(18) = 1s2 2s2 2p6 3s2 3p6

Fe(26) = 1s2 2s2 2p6 3s2 3p6 3d6

Cu(29) = 1s22s22p63s23p63d104s1

Zn2+( 29) =1s22s22p63s23p63d10

As =1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p3

Y(39) = [Kr]4d15s2

Ag+= [Kr]4d105s1

I- = [Kr]4d105s25p4

La = [Xe]5d16s2

Wt % of C = 12/(12+55.8*3) * 100 = 6.69%

Simple cubic => 1/4 * 4 = 1 atom in unit cell

wt of unit cell = 209/(6.023*10^23) = 3.47* 10^{-22}g

b.) No. of atoms = 1/209 * (6.023*10^{23}) = 2.88*10^{21}

c.) we need it for a.) not for b.)

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