Chemistry
Grade-9
Easy
Question
The order of elements in the modern periodic table is based on an element's
- Atomic number
- Name
- Chemical symbol
- Atomic mass
Hint:
Arrangement of elements in periodic table is based on atomic number.
The correct answer is: Atomic number
- There are 118 elements in periodic table arranged in 18 groups and 7 periods.
- The horizontal rows are called periods.
- The vertical columns are called groups.
- The order of elements in the modern periodic table is based on an element's atomic number.
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