Q1
How are elements arranged in the periodic table?
ABy increasing atomic number
BBy increasing weight only
CAlphabetically
DRandomly
ICSEClass 9 (ICSE)ChemistryCh 5 · Topic 1
The Periodic Table
The periodic table organises elements by increasing atomic number, grouping elements with similar properties into columns called groups.
Core concept
Elements in the periodic table are arranged in rows (periods) and columns (groups), with elements in the same group sharing similar chemical properties.
How it works
The periodic table reflects periodic trends, like atomic size generally decreasing across a period and increasing down a group.
Why it matters
Metals are found on the left side of the table, non-metals on the right, with metalloids forming a boundary between them.
Key detail
Understanding the periodic table helps predict element properties and behaviours, making it an essential tool in chemistry.
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• Elements are arranged by increasing atomic number.
• Rows are periods; columns are groups.
• Same-group elements share similar properties.
• Atomic size decreases across a period.
• Atomic size increases down a group.
• Metals are on the left side.
• Non-metals are on the right side.
• Metalloids form the boundary between them.