(a) Three elements A, B and C have atomic numbers 8, 11 and 12 respectively.
CHEMISTRY
WAEC 1992
(a) Three elements A, B and C have atomic numbers 8, 11 and 12 respectively.
(i) Write the formula of the compound formed by the chemical combination of A and B.
(ii) State which of the three elements belong(s) to the s-block of the Periodic Table. Give reason for your answer:
(b) List the component elements of bleaching powder.
Explanation
(a)(i) B\(_2\)A
(ii) B and C are the elemems belonging to S-block of the Periodic Table because their outermost I electrons are just filled in S-sub energy level.
(b) Calcium, Oxygen, Chlorine
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