A) Which two elements have the same ground state electron configuration? a. Pd a

Question

A) Which two elements have the same ground state electron configuration?
a. Pd and Pt
b. Cu and Ag
c. Fe and Cu
d. Cl and Ar
e. no two elements have the same ground state electron configuration

B) of the following, which gives the correct    order for atomic radius for Ca, K, As, Ge, and Kr?
a. Ca>K>As>Ge>Kr
b. Kr>Ge>As>K>Ca
c. Ge>As>Kr>K>Ca
d.K>Ca>Ge>As>Kr
e. Kr>As>Ge>Ca>K

C)Which ion below has the largest radius?
a. Cl+
b. K+
c. Br+
d. F-
e. Na+

D)a tin atom has 50 electrons. What is the approximate effective nuclear charge felt by the valence electrons?
a. 1
b. 2
c. 3
d. 4
e. 5
f. 6
g. 7
h. 8

Explanation / Answer

a)

By definition, each element has its electron configuration to a set number i.e. Z = 5, then 5 electrons

no two elements have the same ground state electron configuration

b)

atomic radius increases from left to right, top to bottom

Kr is the smallest; K is the largest, therefore

d.K>Ca>Ge>As>Kr
C)

The largest radius are thos negatively charged...

K+ is 133 and F- is 136, therefore choose F-

d)

It has

[Kr] 4d10 5s2 5p2

Therefore, it feels 2+2 = 4 electrons as a charge, in general

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