Three elements, X, Y, and Z have the following electron configurations: X = 1s 2

Question

Three elements, X, Y, and Z have the following electron configurations:

X = 1s

22s22p63s23p6

Y = 1s

22s22p63s2

Z = 1s

22s22p63s23p64s2

a. Identify each element.

b. The atomic radii of the elements are 0.094 nm, 0.157 nm, and 0.202 nm.

Match each element to the appropriate atomic radius. Explain your answers using the shell model and core charge. You should include diagrams and equations in your answer as needed.

c. The first ionization energies are 0.4188 MJ/mol, 0.4958 MJ/mol, and 1.5205 MJ/mol.

Match each element to the appropriate first ionization energy. Explain your answer using the Coulombic potential energy equation. You should include diagrams and equations in your answer as needed.

d. Does your answer to Part C. agree with your answers regarding atomic radius in Part B? Briefly explain.

Explanation / Answer

x--->argon

y---> magnesium

z--->calcium

b)

y--->0.094

x--->0.157

z--->0.202

c)

1.5205-->x

0.4958--->y

0.4188--->z

d) no.because though argon is larger than magnesium it has more ionisation energy because it has inert gas configuration

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