Question

2.4 atomic lewis structures
name:
directions: answer the following questions.

1. write the number of valence electrons in each group (vertical column).
2. draw a lewis dot diagram for each element pictured on the fragmented periodic table.
3. what do you notice about the structure of all the elements in group 1 (hydrogens group)?

what do you notice about the structure of elements in group 18 (heliums group)?

Explanation:

Step1: Recall valence - electron rule

Elements in Group 1 (Hydrogen's group) have 1 valence electron. For example, Hydrogen (H) has 1 valence electron, Lithium (Li) has 1 valence electron etc. In a Lewis - dot diagram for Group 1 elements, there is 1 dot representing the valence electron.

Step2: Recall noble - gas rule

Elements in Group 18 (Helium's group, noble gases) have a full outer shell of electrons. Helium has 2 valence electrons, while other elements in Group 18 (Neon, Argon, etc.) have 8 valence electrons. In their Lewis - dot diagrams, Helium has 2 dots and the others have 8 dots (either as 4 pairs or 8 single dots in some representations).

Answer:

Elements in Group 1 have 1 valence electron and their Lewis - dot diagrams have 1 dot. Elements in Group 18 have a full outer shell (2 for He and 8 for others) and their Lewis - dot diagrams have 2 (for He) or 8 dots.