| An element 'X' belong to 3rd period and group 13 of the Modern Periodic Table. |
| (a) Determine the valence electrons and the valency of 'X'. |
| (b) Molecular formula of the compound formed when 'X' reacts with an element 'Y' (atomic number = 8). |
| (c) Write the name and formula of the compound formed when 'X' combines with chlorine. |
Answer:
X = 13, 2, 8, 3
(a) Valence electron and valency = 3
(b) Y = 8, 2, 6 valency 2.
\[{{X}_{2}}{{Y}_{3}}\]
(c) \[XC{{l}_{3}}\]
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