Question

Seven elements have been represented by the letters a, b, c, d, e, f and g (the letters are not symbols of these elements).

Answer the questions below based on the position of these elements.
1. Select the letter(s) which represent alkali metals. ....................................................................
2. Select the letter(s) which represent elements with complete valence shells. .................... 3. Where would you place an element i with the electronic configuration 2,8,5 in the given
table? ....................................................................
4. How many valence electrons are present in the element denoted by b? .............................
5. How many shells are present in the element represented by a? Also write down its electronic configuration. .....................................................................................................................
6. What is the similarity in the electronic configuration of elements represented by a and h? .................................................................................................................................................................
7. Select the element with highest metallic character. Give reason. ................................................................................................................................................................. .................................................................................................................................................................

8. Out of the elements represented by a, b and c, which element will have the smallest and largest atomic radius. Give a reason. .................................................................................................................................................................. ..................................................................................................................................................................
9. Identify the element e, f and g as metal, non-metal or metalloid. What can you say about the metallic character of these elements?
Explain your answer using the terms electropositive and electronegative. .................................................................................................................................................................. ..................................................................................................................................................................
10. The chemical reactivity of elements a, e and h is the same. Do you agree with this statement? Why or why not?
.................................................................................................................................................................. ..................................................................................................................................................................

Answer 1

Answer:

1.lithium

2.Group 18 elements (helium, neon, and argon are shown) have a full outer, or valence, shell.

3.The element with electronic configuration 2, 8 has a complete octet. Therefore, it is a noble gas. It will be found in group 18 with all the other noble gases.