Q1
How does atomic size change across a period?
ADecreases
BIncreases
CStays the same
DChanges randomly
ICSEClass 10 (ICSE)ChemistryCh 1 · Topic 1
Periodic Properties and Variation of Properties
The periodic table organises elements based on atomic number, showing trends in properties like atomic size, valency, and metallic character
Core concept
Atomic size generally decreases across a period (left to right) due to increasing nuclear charge, and increases down a group due to added electron shells.
How it works
Metallic character decreases across a period and increases down a group, as it relates to the ease of losing electrons.
Why it matters
Valency generally increases from 1 to 4 across a period, then decreases from 4 to 0 (or 1) as elements approach noble gas configuration.
Key detail
Ionisation energy (energy needed to remove an electron) generally increases across a period and decreases down a group.
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• Atomic size decreases across a period.
• Atomic size increases down a group.
• Metallic character decreases across a period.
• Metallic character increases down a group.
• Valency increases 1 to 4 across a period.
• Then decreases 4 to 0 approaching noble gases.
• Ionisation energy increases across a period.
• Ionisation energy decreases down a group.