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Answer the following questions:
Answer variants:
\(12\)th group and \(3\)rd period
Group \(16\), \(3rd\) period
Fast reactive and less abundant in nature
\(18\) vertical columns and groups
1. An element A has atomic number \(16\). To which group and period does it belong to?
2. How many vertical columns are there in the modern periodic table and what are they called?
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