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Questions and Answers
What is a group in chemistry?
What is a group in chemistry?
- A row of elements in the periodic table
- A set of transition metals
- A group of isotopes
- A column of elements in the periodic table (correct)
How many numbered groups are there in the periodic table?
How many numbered groups are there in the periodic table?
- 8
- 20
- 14
- 18 (correct)
Why do elements in the same group have similar characteristics?
Why do elements in the same group have similar characteristics?
- Similar atomic masses
- Similar physical or chemical characteristics of the outermost electron shells (correct)
- Similar physical properties of the innermost electron shells
- Similar chemical properties of the nucleus
What is the modern numbering system for groups in the periodic table?
What is the modern numbering system for groups in the periodic table?
What did the modern numbering system replace?
What did the modern numbering system replace?
Flashcards
What is a group?
What is a group?
A column of elements in the periodic table.
How many groups?
How many groups?
There are 18 numbered groups.
Similar group traits?
Similar group traits?
Elements in the same group have similar physical or chemical characteristics of the outermost electron shells.
Modern group numbers?
Modern group numbers?
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Replaced what?
Replaced what?
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Study Notes
Groups in Chemistry
- A group is a vertical column in the periodic table, consisting of elements that exhibit similar chemical and physical properties due to the same number of electrons in their outermost energy level.
Periodic Table Groups
- There are 18 numbered groups in the periodic table.
Similar Characteristics
- Elements in the same group have similar characteristics because they have the same number of electrons in their outermost energy level, resulting in similar chemical reactivity.
Modern Numbering System
- The modern numbering system for groups in the periodic table is based on the number of electrons in the outermost energy level, ranging from 1 (alkali metals) to 18 (noble gases).
Replacement of Old System
- The modern numbering system replaced the old system, which used Roman numerals (I-VIII) and letters (A, B) to label groups.
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