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Question
How do atomic structures (electron arrangements) change in a period with an increase in atomic numbers moving left to right?
Solution
The size of atoms decreases when moving from left to right in a period. Thus, in a particular period, the alkali metal atoms are the largest and the halogen atoms are the smallest.
Li > Be > B > C > N > O > F
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RELATED QUESTIONS
Consider the following elements: Be, Li, Na, Ca, K. Name the elements of (a) same group (b) same period.
What are the following group known as?
Group 1
Name the alkali metals, How many electron(s) they have in their outermost orbit.
How do alkaline earth metals occur in nature?
Name the gas used in:
Light bulbs
Give reason:
Alkali metals are kept in an inert solvent.
Write a short note on the following type of element –
alkaline earth metals
‘The periodic table contains elements methodically grouped together’.
Give a reason for the following:
Group 1 [I – A] elements are called alkali metals.
State the following:
The group whose elements are unreactive or inert.
