Question

An element belong to period 2 and group 2 the number of valence electrons in the atoms of this elements is

Answer 1

An element belong to period 2 and group 2 the number of valence electrons in the atoms of this elements is 2.

Explanation:

It is known that group of an atom tells the number of valence electrons holded by an atom. On the other hand, period number tells the number of shells present in an atom.

For example, an element belong to period 2 and group 2 will have the electronic configuration as $1s^{2}2s^{2}$.

This means that atomic number of this element is 4 and it is beryllium. And, it has 2 valence electrons.

Learn more about valence electrons:

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Answer 2

Beryllium (Be) is the element that belongs to group II and period II of the periodic table.

• The periodic table is distributed into VIII groups and VII periods. The group II element of the 2nd period is Beryllium.
• It has two valence electrons. We can determine this by identifying the group number of Be.
• Group number of an element is equal to the number of valence electrons in the element. Therefore, the valency of Be is of 2 electrons, same as its group number.
• All group II elements have the valency of two electrons.

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