Lesson 2 Matter
Completion requirements
Special Groups on the Periodic Table
B2.44 labelled periodic table
Digging Deeper?
© Wikimedia Commons
B2.54 alternate periodic table
B2.54 alternate periodic table
There are many different formats for the periodic table: spiral, 3-D Alexander model, etc. You can see many different examples on this wikimedia site or you can download and create your own 3-D Alexander model to have on your desk!
These
are all soft, silvery metals that are very reactive with water and
other substances. All atomic structures contain one valence electron.
These elements are so reactive that they are not found in nature as pure
elements but are quite common
and abundant in ionic compounds bonded to halogens
These are also silvery metals, but they are not as soft or as reactive
as alkali metals. However, they do react easily with oxygen from the air
to form an oxide coating. All atomic structures contain two valence
electrons.
These are reactive non-metals that all have seven valence electrons.
These elements are so reactive that they are not found in nature as pure
elements but are quite common and abundant in ionic compounds bonded to
alkali metals.
These are very stable (unreactive) elements. They are stable because
these atoms containing eight valence electrons, or in other words, the
valences are full of electrons.
B2.50 Neon sign
B2.51 Modified Bohr diagram of neon
These are located in the centre of the periodic table. These are metals that are fairly stable, chemically speaking, with various physical appearances.
Watch This
How the Elements Got Their Names @ YouTube It’s Okay To Be Smart
Every wonder why the symbol for sodium is Na or for gold is Au? This fun video looks at how different elements got their names and symbols.
Read This
Please read pages 29 to 33 in your Science 10 textbook. Make sure you take notes on your readings to study from later. You should focus on the design and layout of the periodic
table. Remember, if you have any questions or you do not understand something, ask your teacher! Practice Questions
Complete the following practice questions to check your understanding of the concept you just learned. Make sure you write complete answers to the practice
questions in your notes. After you have checked your answers, make corrections to your responses (where necessary) to study from.- Which alkali metal will have five energy levels in its modified Bohr diagram?
Rubidium. Alkali metals are group 1 elements, and having five energy levels means the element is located in the fifth period. - Which energy level will be the valence energy level for a modified Bohr diagram of selenium? How many electrons will be in the valence energy level of a modified Bohr diagram of selenium?
The fourth energy level. Selenium is located in the fourth period. Selenium will have six valence electrons because it is in group 16, as the last digit of the group number is equal to the number of valence electrons. - What element has three valence electrons in its third energy level?
Aluminum. The number of valence electrons is the last digit of the group number; so three valence electrons means the element is located in group 13. Third energy level means the element is in period 3. - Which halogen will have two energy levels in its modified Bohr diagram?
Fluorine. Group 17 is classified as halogens. Fluorine is located in period 2, as the number of energy levels is directly related to the period number. - A student made the following statements about the element beryllium:
- It’s modified Bohr diagram will have two valence electrons.
- It will be a non-conductor of electricity.
- It’s modified Bohr diagram will have two valence electrons.
- It can be classified as an alkaline-earth metal.
Which statement is incorrect?
B. It is a metal, so it will be conductive.