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 0 answersPost by Soheil Pana on April 15, 2014In group-14 the atom will eighter have a charge of 4+ or 4-. How do you determin the oxidation number in this case? Also wanted to say that you're great teacher. Thanks ! 1 answerLast reply by: Professor EbsSun Apr 21, 2013 1:24 AMPost by Yisrael Harris on April 20, 2013((4/5)*11) + ((1/5)*10) = 10.80 1 answerLast reply by: Professor EbsSun Apr 21, 2013 1:26 AMPost by Matthew Foxworthy on February 23, 2013is there a lecture about how many electrons are in each subshell or how to figure that out? 1 answerLast reply by: Professor EbsTue Oct 23, 2012 5:44 PMPost by Donna Shepherd on October 23, 2012How do you draw a structural formula of an element?

### Periodic Table

• The Periodic Table of the Elements organizes all the different elements, or different types of atoms.
• ATOMIC NUMBER gives the number of protons in one atom of the element.
• CHEMICAL SYMBOL is the abbreviation for each element
• ATOMIC MASS is measured not in grams, but in atomic mass units (amu). Atomic mass is the weighted average mass of the isotopes.
• The periodic table groups elements with similar chemical and physical properties. Each column of the periodic table is called a group. Each row of the periodic table is called a period.
• Each element in the same group has the same number of electrons in its outermost energy level, the same dot diagram, and the same oxidation number.
• Each element in the same period has the same number of electron energy levels.
• Ions form when atoms gain or lose electrons to fill their outermost energy level.
• The oxidation number is the charge of the atom once it has gained or lost electrons to become an ion.
• Metals are found on the left side of the periodic table, nonmetals are on the right, and metalloids are between metals and nonmetals.

### Periodic Table

What is each column of the periodic table called?
A group
What is each row of the periodic table called?
A period
An element with an atomic number of 11 has how many protons?
11 protons
How many periods and groups does the periodic table have?
7 periods and 18 groups
What are the electrons found in the outermost energy level called?
Valence electrons
How many valence electrons do the elements in group 18 have?
8 valence electrons
An element with 6 valence electrons needs to pick up how many electrons to be full?
2 more electrons to have 8 valence electrons, which fills the outermost electron level.
An atom that picks up two electrons to fill its outermost energy level will have what charge or oxidation number?
The atom will have a charge or oxidation number of -2.
How does an atom become a positively charged ion?
By losing one or more electrons.
what is the only nonmetal found on the left side of the periodic table?
Hydrogen

*These practice questions are only helpful when you work on them offline on a piece of paper and then use the solution steps function to check your answer.

### Periodic Table

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

• Intro 0:00
• Periodic Table 0:06
• Atomic Number, Chemical Symbol, and Atomic Mass
• Groups and Periods 4:14
• Groups and Periods
• Electron Dot Diagrams 10:05
• Electron Dot Diagrams
• Ion Formation 19:09
• An Ion Forms When an Atom Gains or Loses Electrons
• A Positive Ion Forms When an Atom Loses and Electron
• A Negative Ion Forms When an Atom Gains an Electron
• Oxidation Numbers 28:51
• Oxidation Numbers
• Metals, Nonmetals, Metalloids 34:52
• Metals, Nonmetals, Metalloids
• Example 1: Group and Period 37:39
• Example 2: Electron Dot Diagrams 39:50
• Example 3: How do Fluorine and Calcium Become Ions? 42:10
• Example 4: What Are 2 Ways to Find the Oxidation Number of Sodium? 44:58