Chapter 5: Periodic Classifications of Elements

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Q
Periodic Classifications of Elements

Question:

Name:

(a) three elements that have a single electron in their outermost shells.

(b) two elements that have two electrons in their outermost shells.

(c) three elements with filled outermost shells.

Answer:

(a)- The elements of Group 1 have one valence electron.

Lithium (3) = 2, 1

Sodium (11) = 2, 8, 1

Potassium (19) = 2, 8, 8, 1

(b)- The elements of Group 2 have two valence electrons.

Beryllium (4) = 2, 2

Magnesium (12) = 2, 8, 2

(c)- The elements of Group 18 have filled valence electrons.

Helium (2) = 2

Neon (10) = 2, 8

Helium (18) = 2, 8, 8


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