Chemistry
Atomic number of element M is 12 and it forms an ionic compound with element L.
(a) Which of the following atomic numbers will match L?
i. 14
ii. 10
iii. 8
(b) What is the name given to the members of the group to which element M belongs?
(c) Draw the electron dot structure of the compound formed between M and L.
Answer
Atomic number of element M = 12
Electronic configuration of element M = 2, 8, 2
∴ Element M is a metal with valency 2, it will form M2+ ion
(a)
| Atomic Number | Configuration | Evaluation |
|---|---|---|
| 14 | 2, 8, 4 | Tends to share electrons and forms covalent bonds |
| 10 | 2, 8 | Noble gas – inert, does not form ions |
| 8 | 2, 6 | Non-metal, gains 2 electrons to form ionic compounds |
The correct match for L will be (iii), because M can form an ionic compound with L (M2+ + L2- = ML)
(b) As element M contains 2 valenced electrons, it belongs to Group 2 of the Periodic Table and group 2 elements are called Alkaline Earth Metal.
(c) The electron dot structure of the compound formed between M and L is shown below:
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