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Modern Quantum Theory

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Of the following, which gives the correct order for atomic radius for Mg, Na, P, Si and Ar?

a. Si > P > Ar > Na > Mg
b. Ar > Si > P > Na > Mg
c. Ar > P > Si > Mg > Na
d. Mg > Na > P > Si > Ar
e. Na > Mg > Si > P > Ar

A tin atom has 50 electrons. Electrons in the ___________ subshell experience the lowest effective nuclear charge.

a. 1s
b. 3d
c. 5s
d. 5p
e. 3p

Of the following elements, which has the largest first ionization energy?

a. B
b. P
c. N
d. Si
e. C

Which equation correctly represents the first ionization of calcium?

a. Ca-(g) Ca(g) + e-
b. Ca(g) Ca+(g) + e-
c. Ca+(g) + e- Ca(g)
d. Ca(g) Ca-(g) + e-
e. Ca(g) + e- Ca-(g)

Which of the following does not have eight valence electrons?

a. Ca+
b. Xe
c. Rb+
d. Br-
e. All of these have eight valence electrons.

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Question 1: c
The atomic radius increases with the atomic numbers within a given row in the periodic table. Therefore opiton c shows the decreasing atomic numbers from the left to right, so the atomic radius decreases from Ar, P, Si, Mg, to Na.

Question 2: d
the further away from the atomic nucleus, the lower effective nuclear charge the subshell experiences. 5p is the furthest subshell among those above choices, hence it experiences the lowest effective nuclear ...

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