(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 a...
Question 1 Report
(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.
Answer Details
The elements are A (atomic number 8, oxygen), B (atomic number 11, sodium) and C (atomic number 12, magnesium).
(a)(i) Formula of the compound of A and B
Sodium (B) forms Na+ and oxygen (A) forms O2-, so the compound is sodium oxide, Na2O.
(ii) Elements in the s-block
B (sodium, 1s22s22p63s1) and C (magnesium, 1s22s22p63s2) belong to the s-block, because their highest-energy (valence) electron enters an s-orbital. Oxygen (A) is a p-block element (its last electron enters a 2p orbital).
(b) Component elements of bleaching powder
Bleaching powder is calcium oxochlorate(I) chloride, CaOCl2. Its component elements are calcium, chlorine and oxygen.
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