Question

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how many valence electrons are in each element?
part a
cs
express your answer as an integer.
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part b
si
express your answer as an integer.

Explanation:

Step1: Determine the group of the element

Cesium (Cs) is in Group 1 of the periodic table.

Step2: Relate group number to valence electrons

For main - group elements (Groups 1 - 2 and 13 - 18), the group number (for Groups 1 - 2, it is straightforward; for Groups 13 - 18, subtract 10) gives the number of valence electrons. Since Cs is in Group 1, it has 1 valence electron.

Step3: Determine the group of the element

Silicon (Si) is in Group 14 of the periodic table.

Step4: Relate group number to valence electrons

Using the rule for main - group elements (subtract 10 for Groups 13 - 18), \(14 - 10=4\). So Si has 4 valence electrons.

Answer:

Part A: 1
Part B: 4