Electrons and the Periodic Table Answers

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1
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Which of the following elements has the fewest valence electrons?

A
beryllium
B
boron
C
carbon
D
lithium
2
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Which element does the electron configuration 1s22s22p2 represent?

A
B
B
C
C
N
D
K
3

Which is the electronic configuration for oxygen?

A
1s2 2s2 2p1
B
1s2 2s2 2p3
C
1s2 2s2 2p4
D
1s2 2s2 2p6
4

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.
5

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

A
barium
B
calcium
C
rubidium
D
strontium
6

Which is the noble gas notation for chlorine?

A
[Ne] 4s2 4p5
B
[Ne] 3s2 3p5
C
[Ne] 3s2 3p3
D
[Ne] 3p2 3p5
7

Which is the noble-gas notation for lead (Pb)?

A
[Rn]6s24f145d106p2
B
[Rn]6s25d106p2
C
[Xe]6s24f145d106p2
D
[Xe]6s25d106p2
8

How many valence electrons does lithium (Li) have available for bonding?

A
1
B
2
C
3
D
4
9

The electron configuration of nitrogen (N) is

A
1s22s22p3
B
1s22s22p4
C
1s22s22p5
D
1s22s22p6
10

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

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

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