Valence Electrons and Periodic Groups Worksheet

Question 1

Which element is in the same group as magnesium?

1. Na
2. Al
3. Ca
4. Cl

Question 2

A neutral chlorine atom has electrons in its first three energy levels in the arrangement 2, 8, 7. Determine the total number of electrons and the number of valence electrons.

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Question 3

Explain how sodium and potassium can have similar chemical behavior even though they have different total numbers of electrons.

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Question 4

Which arrangement represents an atom with a full outer energy level in a simple shell model?

1. 2, 4
2. 2, 6
3. 2, 7
4. 2, 8

Question 5

Which cards represent elements in the same periodic group?

1. P and Q
2. P and R
3. Q and S
4. R and S

Question 6

Use occupied energy levels to explain which period contains the elements represented by P and Q.

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Question 7

What charge results if the atom on card R loses its outermost electron?

1. −2
2. −1
3. +1
4. +2

Question 8

Identify the element on card S using the total number of electrons and the periodic table. Explain the connection.

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