Q1
How did Mendeleev arrange his periodic table?
ABy atomic mass
BBy atomic number
CBy colour
DRandomly
SSCClass 10 (SSC)Science and Technology (विज्ञान आणि तंत्रज्ञान)Ch 2 · Topic 1
Periodic Classification of Elements
The periodic table organises elements by increasing atomic number, revealing patterns in properties that repeat periodically across the tabl
Core concept
Mendeleev's early periodic table arranged elements by atomic mass, while the modern periodic table arranges them by atomic number, resolving earlier anomalies.
How it works
Elements in the same group (vertical column) have similar chemical properties due to having the same number of valence electrons.
Why it matters
Elements in the same period (horizontal row) show gradually changing properties as atomic number increases across the row.
Key detail
The periodic table helps predict element properties, understand chemical bonding, and organise chemistry knowledge systematically.
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Quick notes
• Mendeleev: arranged by atomic mass originally.
• Modern table: arranged by atomic number.
• This resolved earlier anomalies.
• Same group (column): similar properties.
• Due to same valence electron count.
• Same period (row): gradually changing properties.
• As atomic number increases.
• Table predicts properties, aids chemistry understanding.