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Section 2: Classification of the Elements

Classification of the Elements

1.

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Why are both hydrogen and cesium s-block elements, when hydrogen has one electron and cesium has 55?
A)All blocks contain at least one element from each period.
B)Blocks of elements on the periodic table are based only on an element's valence electrons.
C)The s-block includes only the most reactive elements.
D)They have identical electron configurations.
2.
What characteristic do atoms in the same group of elements share?

Period 1 hydrogen 1s 11s 1
Period 2 lithium 1s 22s 1[He]2s 1
Period 3 sodium 1s 22s 22p 63s 1 [Ne]3s 1
Period 4 potassium1s 22s 22p 63s 23p 64s 1[Ar]4s 1


A)They have the same atomic mass.
B)The have the same number of electron orbitals.
C)They have the same number of valence electrons.
D)They have similar physical properties.
3.
Atoms of elements in group 1A have ____________.
A)one electron in their outermost energy level
B)two electrons in their outermost energy level
C)seven electrons in their outermost energy level
D)eight electrons in their outermost energy level
4.
Which block consists of the elements in groups 3A through 8A?
A)s block
B)p block
C)d block
D)f block
5.
Elements in the d block are also known as _______________.
A)alkali metals
B)alkaline earth metals
C)transition metals
D)lanthanide metals
6.
Which of the blocks on the periodic table contains the most elements?
A)s block
B)p block
C)d block
D)f block
7.
Which of the following is the general valence electron configuration for the alkaline earth elements?
A)ns1
B)ns2
C)ns2np1
D)ns2np2
8.
How would you classify an element that has an electron configuration of [Kr]5s24d105p5?
A)a representative element
B)a transition metal
C)an alkali metal
D)a noble gas
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