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Define periodic.
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Define periodic.
Periodic refers to patterns that emerge at regular intervals in the periodic table when the elements are sorted by mass.
Who created the first draft of the periodic table in 1869?
Dmitri Mendeleev created the first draft of the periodic table in 1869.
True or False?
Mendeleev used atomic numbers to arrange his periodic table.
False.
Mendeleev used properties of the elements (and their compounds) to arrange them vertically and atomic mass to arrange them horizontally.
True or False?
Mendeleev forced all known elements to fit into his table without leaving any gaps.
False.
Mendeleev left gaps in the table that he thought would best be filled by elements that had not yet been discovered.
True or False?
Mendeleev arranged elements strictly by increasing atomic mass.
False.
Mendeleev arranged elements by increasing atomic mass but also considered chemical properties.
An example of this is switching tellurium and iodine because iodine fitted better with the other halogen elements, even though tellurium is heavier.
What allowed Mendeleev to predict the existence and properties of then-unknown elements?
Mendeleev's decision to leave gaps in the table, rather than forcing elements to fit, allowed him to predict the existence and properties of then-unknown elements.
True or False?
Elements with similar properties are arranged in the same group on the Periodic Table.
True.
Elements with similar properties are arranged in the same group on the Periodic Table.
What is a group?
A group is a vertical column on the Periodic Table.
What do periods in the Periodic Table indicate?
Periods indicate the number of electron shells in an atom.
How are elements arranged in the Periodic Table?
Elements are arranged by increasing atomic number in periods and groups.
True or False?
Each element has one proton more than the previous one.
True.
Each element has one proton more than the previous one.
What is a period?
A period is a horizontal row on the Periodic Table.
Why are elements arranged by increasing atomic number?
Elements are arranged by increasing atomic number so that they end up in columns with similar properties.
What do groups in the Periodic Table indicate?
Groups indicate the number of outer electrons in an atom.
True or False?
Most elements are metals.
True.
Most elements are metals.
Where are non-metals generally located on the Periodic Table?
Non-metals are generally located on the right-hand side of the Periodic Table.
What is an electronic configuration?
An electronic configuration is the arrangement of electrons in shells.
True or False?
Electrons occupy the shell closest to the nucleus first.
True.
Electrons occupy the shell closest to the nucleus first.
What is the maximum number of electrons in the first shell?
The first shell can hold a maximum of 2 electrons.
What information does the group give about the electronic configuration?
The group gives the number of outer electrons.
True or False?
Chlorine has 3 shells of electrons.
True.
Chlorine has 3 shells of electrons.
State the electronic configuration of sulfur.
The electronic configuration of sulfur is 2, 8, 6.
What does the last number in an electronic configuration represent?
The last number in an electronic configuration represents the number of outer electrons.
What is the maximum number of electrons in the second and third shells?
The second and third shells can each hold a maximum of 8 electrons.
In terms of electrons, what are other words for shell?
In terms of electrons, other words for shell include:
Orbit
Orbital
True or False?
Most elements have full outer shells of electrons.
False.
Most elements do not have full outer shells of electrons.
True or False?
Atoms are more stable if they can completely fill their outer shell with electrons.
True.
Atoms are more stable if they can completely fill their outer shell with electrons.
What is the electronic configuration of carbon?
The electronic configuration of carbon is 2.4.
True or False?
The number of notations in the electronic configuration shows the group that the element is in.
False.
The number of notations in the electronic configuration shows the period that the element is in, indicating the number of occupied shells.
Which element has the electronic configuration 2.8.1?
The element with the electronic configuration 2.8.1 is sodium.
Silicon has ..... electron shells and ..... outer electrons .
Silicon has 3 electron shells and 4 outer electrons .
True or False?
Helium has only one shell of electrons.
True.
Helium has only one shell of electrons - the first and innermost shell, which holds only 2 electrons.
True or False?
Noble gases have full outer shells of electrons.
True.
Noble gases have full outer shells of electrons.
State the electronic configuration of neon.
Neon's electronic configuration is 2. 8.