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Chapter 4: Problem 6

How do you determine how many dots to put around the Lewis symbol of an element?

Short Answer

Expert verified
To determine how many dots to put around the Lewis symbol, find the element's group number on the periodic table which corresponds to the number of valence electrons; place this number of dots around the element's symbol, one per side before pairing.

Step by step solution

01

Identify the Element

Determine the element in question and find its atomic number from the periodic table. The atomic number tells you the number of protons and, for a neutral atom, the number of electrons.
02

Determine the Number of Valence Electrons

Use the periodic table to find out which group (column) the element belongs to. Elements in groups 1 and 2 have as many valence electrons as their group number, while elements in groups 13 to 18 have the group number minus 10 valence electrons. For transition metals, the determination of valence electrons can be more complex and might not be predictable from their position in the periodic table.
03

Draw the Lewis Symbol

Represent the element with its chemical symbol. Then, place dots around the symbol to represent the valence electrons. The dots are placed one on each side before pairing up (top, bottom, left, right) following the 'octet rule' which suggests that atoms are most stable when surrounded by 8 electrons.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Valence Electrons
Valence electrons play a pivotal role in chemical reactions and bonding. They are the electrons found in the outermost shell of an atom and determine the chemical properties of the element. When drawing Lewis symbols, it's the valence electrons that are depicted as dots around the element's symbol. A quick tip for finding the number of valence electrons for main group elements is to look at the group number; for instance, carbon is in group 14, so it has 4 valence electrons. Learning to identify the number of valence electrons helps in predicting how an atom will interact with others to form compounds.
Periodic Table
The periodic table is an organized chart of elements that provides essential information at a glance. Each element is placed according to its atomic number and grouped with elements that have similar chemical properties. For students, understanding the layout of the periodic table is crucial—it's where you find the group numbers which help you determine the valence electrons. The table is also divided into blocks (s, p, d, f) that indicate the type of subshell the valence electrons occupy, which further helps in categorizing elements based on their chemical behavior.
Octet Rule
The octet rule is a chemical rule of thumb that states atoms tend to bond in such a way that they have eight electrons in their valence shell, resulting in a configuration similar to a noble gas. When applying the octet rule, remember that it's more of a guideline than a strict rule, as there are exceptions. For instance, hydrogen is content with 2 electrons, and there are elements with expanded octets. However, the octet rule is invaluable when predicting the reactivity of an element and is visually represented in Lewis symbols, where each dot symbolizes an attempt to achieve a stable octet.
Atomic Number
The atomic number of an element is a fundamental property, signifying the number of protons in the nucleus of its atoms. This number, found in the periodic table, also indicates the number of electrons in a neutral atom. Remember, it's the electrons, especially the valence electrons, that chiefly influence an atom's reactivity and bonding capabilities. For instance, sodium has an atomic number of 11, indicating it has 11 electrons. Knowing this, you can effortlessly identify that sodium, being in group 1, has one valence electron to offer in bonds.
Chemical Symbol
A chemical symbol is a one or two-letter abbreviation that represents an element. These symbols, derived from either English or Latin names, are the shorthand used worldwide by chemists. When sketching a Lewis symbol, the chemical symbol is central, surrounded by dots; each dot is a valent electron. The placement of these dots helps in visualizing how an element might bond with others. For example, oxygen has the chemical symbol 'O' and typically forms two bonds as it has six valence electrons, depicted with six dots around the 'O' in its Lewis symbol.

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Most popular questions from this chapter

Because of increasing evidence of damage to the ozone layer, chlorofluorocarbon (CFC) production was banned in 1996. However, there are about 100 million auto air conditioners in operation that still use CFC-12 (CF2Cl2). These air conditioners are recharged from stockpiled supplies of CFC-12. If each of the 100 million automobiles contains 1.1 kg of CFC-12 and leaks 25% of its CFC-12 into the atmosphere per year, how much chlorine, in kg, is added to the atmosphere each year due to auto air conditioners? (Assume two significant figures in your calculations.)

According to the Lewis model, what is a chemical bond?

Without doing any calculations, determine which element in each of the compounds will have the highest mass percent composition. a. CO b. N2O c. C6H12O6 d. NH3

Calculate the number of moles in each sample. a. 72.5 g CCl4 b. 12.4 g C12H22O11 c. 25.2 kg C2H2 d. 12.3 g of dinitrogen monoxide

Write a formula for the compound that forms between potassium and each polyatomic ion. a. carbonate b. phosphate c. hydrogen phosphate d. acetate
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