Question

The total number of element(s) with valency 2 in the second period of Modern Periodic Table is/are​

Answer 1

There are two elements with valency 2 in the second period of modern periodic table.

• There are 8 elements in the second period of the modern periodic table. (lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, and neon.)
• These 8 elements have different values of valency.
• Among those 8 elements only beryllium and oxygen have the valency of 2.
• Hence, the total number of elements with valency of 2, in the second period of modern periodic table, is two.

Answer 2

Answer:

Explanation:

• Lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, and neon are all found in the second period.
• This time corresponds to the filling of the second $(n = 2)$ shell, notably its $2s$ and $2p$ subshells, in a quantum mechanical description of atomic structure.
• Two electrons can be lost or gained in an element having a valency of two.
• It belongs to group 2 if it loses two electrons, and group 16 if it acquires two electrons, according to the Modern Periodic Table.

Hence, The total number of element(s) with valency 2 in the second period of Modern Periodic Table is/are two.

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