(a) Specify the charge is carried by anions? What happens to an element ‘A’ if its atom gains two electrons?

(b) Classify the substances given below into elements and compounds.

NaCl, Cu, CaCO3, Zn, O2, H2O, F2, Hg, Diamond

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Solution

(a) Anions are negatively charged. If an element gains two electrons then it will get converted into a bivalent anion (A2-).

(b) Elements - Diamond, Hg, Zn, Cu, O2, F2

Compounds - NaCl, CaCO3, H2O

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Question 3

Classify the substances given below into elements and compounds.
NaCl, Cu, Zn, Hg, Diamond

Question 1

Specify the charge carried by anions? What happens to an atom ‘A’ if its atom gains two electrons?

C a C O_{3}

H_{2} O

(a) What is meant by (i) elements (ii) compounds, and (iii) mixtures? Write down the names of two elements, two compounds and two mixtures.

(b) Classify the following into elements, compounds and mixtures :

Marble, Air, Gold, Brass, Sand, Diamond, Graphite, Petroleum, Common salt, Sea-water, Chalk

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