Electrons and the Periodic Table Answers

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1
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Which element does the electron configuration 1s22s22p2 represent?

A
B
B
C
C
N
D
K
2
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Hydrogen reacts with an element to form a compound. Which element would have the most valence electrons available to react with hydrogen?

A
oxygen
B
chlorine
C
neon
D
nitrogen
3

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.
4

The electron configuration of nitrogen (N) is

A
1s22s22p3
B
1s22s22p4
C
1s22s22p5
D
1s22s22p6
5

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

A
1
B
2
C
10
D
12
6

Which of the following elements has the fewest valence electrons?

A
beryllium
B
boron
C
carbon
D
lithium
7

Which is the electronic configuration for oxygen?

A
1s2 2s2 2p1
B
1s2 2s2 2p3
C
1s2 2s2 2p4
D
1s2 2s2 2p6
8

Which is the noble gas notation for chlorine?

A
[Ne] 4s2 4p5
B
[Ne] 3s2 3p5
C
[Ne] 3s2 3p3
D
[Ne] 3p2 3p5
9

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

A
barium
B
calcium
C
rubidium
D
strontium
10

The noble-gas notation for tin (Sn) will contain the symbol

A
[Ar].
B
[Kr].
C
[Xe].
D
[Rn].

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