3(i)
Elements A, B, C & D have the following electronic configurations:
[A = 2, 8, 7 B = 1 C = 2, 5 D = 2, 8, 1]
Answer the following questions:
(a) Identify the element that will form an alkali when reacted with water.
(b) State the formula of the compound formed when D reacts with C.
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(a) Element D (configuration 2, 8, 1) is an alkali metal (sodium). It reacts with water to form an alkali (sodium hydroxide).
(b) D has a valency of 1 (forms D+) and C has a valency of 3 (forms C3-). Therefore the formula of the compound is D3C.