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Question
Name and state the following with reference to the elements of the first three periods of the periodic table.
Noble gas with duplet arrangement of electrons.
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Solution
Element is Helium
RELATED QUESTIONS
What are the following group known as?
Group 1
What are the following group known as?
Group 18
Name two elements of each group.
How do atomic structures (electron arrangements) change in a period with an increase in atomic numbers moving left to right?
Write the electronic configuration of the first two alkaline earth metals.
Give reason:
Alkali metals and halogens do not occur free in nature.
Give reason:
Alkali and alkaline earth metal compounds usually form electrovalent compounds.
Give reason:
Inert gases do not form compounds.
State the main helpful features of the long form of the periodic table.
State the following:
The group whose elements are unreactive or inert.
