Question

Observe the following diagram and write the answers of the following questions:


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


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


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


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


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

chemical reaction.​

Answer 1

can radioisotopes be prepared artificially? if yes, name the process

can radioisotopes be prepared artificially? if yes, name the process(a) The diagram shows two parallel rays A and B of red and violet colour

can radioisotopes be prepared artificially? if yes, name the process(a) The diagram shows two parallel rays A and B of red and violet colourrespectively incident on the air glass boundary

can radioisotopes be prepared artificially? if yes, name the process(a) The diagram shows two parallel rays A and B of red and violet colourrespectively incident on the air glass boundaryI

can radioisotopes be prepared artificially? if yes, name the process(a) The diagram shows two parallel rays A and B of red and violet colourrespectively incident on the air glass boundaryIA

can radioisotopes be prepared artificially? if yes, name the process(a) The diagram shows two parallel rays A and B of red and violet colourrespectively incident on the air glass boundaryIAB

can radioisotopes be prepared artificially? if yes, name the process(a) The diagram shows two parallel rays A and B of red and violet colourrespectively incident on the air glass boundaryIABComplete the diagram showing the refracted rays for both.

Answer 2

explanation:

Ans. (a) The atomic numbers of first elements in the second group:

Elements Atomic number Beryllium (Be) - 4

(2) Magnesium (Mg) - 12

B) The number of valence electrons of the element in the halogen group is 7 .

(c) The diagram of electronic configuration of

(c) The diagram of electronic configuration ofmagnesium.

(d) As a period is completed, a new shell c electrons is added to the next element.

(e) He, Ne, Ar (Any two).

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