Question

Write the Lewis symbol for atoms of each of the following elements: (a) \(\mathrm{Al}\), (b) \(\mathrm{Br}\), (c) \(\mathrm{Ar}\), (d) \(\mathrm{Sr}\).

Short answer

Short Answer: The Lewis symbols for the given elements are as follows: (a) Al\( \cdot \cdot \) (3 valence electrons) (b) Br with seven valence electrons as: ``` . . Br . . ``` (c) Ar with eight valence electrons arranged according to the octet rule: ``` . . . Ar . . . ``` (d) Sr\( \cdot \cdot \) (2 valence electrons)

Step-by-step solution

(a) Writing the Lewis Symbol for Al

Aluminum (Al) is a Group 13 element in the periodic table, hence it has 3 valence electrons. To write the Lewis symbol, we first write the chemical symbol for the element, Al, and then place three dots around it to represent the valence electrons. Lewis Symbol for Al: Al\( \cdot \cdot \) We've placed three valence electrons around the symbol of Aluminum.

(b) Writing the Lewis Symbol for Br

Bromine (Br) belongs to Group 17 in the periodic table, which means it has 7 valence electrons. To write the Lewis symbol, we first write the chemical symbol for Bromine, Br, and then place seven dots around it to represent valence electrons. Lewis Symbol for Br: Br\( \cdot \) ``` . . Br . . ``` We've placed seven valence electrons around the symbol of Bromine.

(c) Writing the Lewis Symbol for Ar

Argon (Ar) is a Group 18 element, indicating that it has 8 valence electrons. To write the Lewis symbol, we first write the chemical symbol of Argon, Ar, and then place eight dots around it to represent valence electrons. Lewis Symbol for Ar: Ar\( \cdot \) ``` . . . Ar . . . ``` The eight valence electrons are distributed according to the octet rule and placed around the symbol of Argon.

(d) Writing the Lewis Symbol for Sr

Strontium (Sr) is located in Group 2 of the periodic table, meaning that it has 2 valence electrons. To write the Lewis symbol, we write the chemical symbol for Strontium, Sr, and then place two dots around it to represent the valence electrons. Lewis Symbol for Sr: Sr\( \cdot \cdot \) We've placed two valence electrons around the symbol of Strontium. To sum up, we've written the Lewis symbols for each of the following elements: (a) \(\mathrm{Al}\), (b) \(\mathrm{Br}\), (c) \(\mathrm{Ar}\), and (d) \(\mathrm{Sr}\).