AnswersChemistry Honors AAtomic Numbers and Electron Configurations

Electrons and the Periodic Table Answers

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It is easier to determine the electron configurations for the p-block elements in periods 1, 2, and 3 than to determine the electron configurations for the rest of the p-block elements in the periodic table because

A
they have a larger number of core electrons.
B
their electrons are assigned to s and p orbitals only.
C
their electrons are placed in a higher number of orbitals.
D
they have more valence electrons available for bonding.
2
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Which statement describes the 3d, 4s, and 4p orbitals of Arsenic (As) based on its electronic configuration and position in the periodic table?

A
The 3d and 4s orbitals are completely filled, and the 4p orbital is partially filled.
B
The 3d orbital is completely filled, and the 4s and 4p orbitals are partially filled.
C
The 3d, 4s, and 4p orbitals are completely filled.
D
The 3d, 4s, and 4p orbitals are partially filled.
3

What is the number of valence electrons in cadmium (Cd)?

A
1
B
2
C
10
D
12
4

In which block of the periodic table is uranium (U) found?

A
s block
B
d block
C
p block
D
f block
5

Which is the electron configuration for nobelium (No)?

A
[Rn]7s25f14
B
[Rn]7s25f7
C
[Ne]3s23p7
D
[Xe]6s25d1
6

Which element does the electron configuration 1s22s22p2 represent?

A
B
B
C
C
N
D
K
7

Which of these elements has an electron configuration of [Kr]5s2?

A
barium
B
calcium
C
rubidium
D
strontium
8

The electron configuration of nitrogen (N) is

A
1s22s22p3
B
1s22s22p4
C
1s22s22p5
D
1s22s22p6
9

Among the elements that commonly react with hydrogen, which has the greatest total number of valence electrons?

A
oxygen
B
chlorine
C
neon
D
nitrogen
10

Which is the noble gas notation for chlorine?

A
[Ne] 4s2 4p5
B
[Ne] 3s2 3p5
C
[Ne] 3s2 3p3
D
[Ne] 3p2 3p5

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