Observe the following diagram and write the answer of the following question.

Write the atomic numbers of the first two elements in the second group.

Write the number of valence electrons of the elements in the halogen group.

Draw the diagram of the electronic configuration of the magnesium atom.

After completing a period, what change does take place in the electronic configuration of the next element?

Write the names of any two elements from the diagram which do not take part in a chemical reaction.

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Solution

The atomic number of the first two elements in the second group: Elements Atomic number

Beryllium (Be) 4

Magnesium (Mg) 12

2. The number of valence electrons of the elements in the halogens group is 7.

3.The diagram of the electronic configuration of the magnesium atom.

4. As a period is completed, a new shell of electrons is added to the next element.

5. He, Ne, Ar (Any two)

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