Q. The number of groups in modern periodic table?
Solution:
- A group is a column of elements in the periodic table of the chemical elements.
- Elements having same number of valence electrons are placed in the same group.
- The number of periods in modern periodic table – 7.
- The longest period – 6 th period .
- The shortest period – 1 st period .
- The horizontal columns are known as periods in the modern periodic table.
- Elements having same number of shells are placed in the same period .
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