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प्रश्न
Select the correct answer from the choice given below.
The negatively charged particles in an atom
विकल्प
protons
neutrons
electrons
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उत्तर
electrons
संबंधित प्रश्न
Fill in the blank
Chalk powder dissolved in water is an example of a Chalk powder dissolved in water is an example of a _________.
Name: an Inert Gas
Give reason: A frying pan is made up of steel but its handle is made up of wood.
Tick (√) the correct alternative from the choice given for the following statement.
Gold is used to make jewellery because
Elements are classified into – Metals – Non-metals – Metalloids – Noble gases. State which of A, B, C, D is a –
1. Metallic element
2. Non-metallic element
3. Metalloid
4. Noble gas.
A: Is non-malleable, non-ductile & a poor conductor of electricity ___________
B: Has lustre, is malleable and ductile & a good conductor of heat ___________
C: Is unreactive and inert and present in traces in the air _________
D: Shows properties of both metals and non-metals ___________
Match the statements in List I – 1 to 10 correct answers in List II-A to J.
| List I | LIst II | ||
| 1 | Fluorine and chlorine | A | Nitrogen |
| 2 | A diatomic molecule | B | Boron |
| 3 | A molecule containing the elements hydrogen and oxygen. | C | Reactants |
| 4 | A metalloid - showing properties of both metals and non-metals. | D | Chemical Formula |
| 5 | The term used for the substances which take part in the chemical reaction | E | Halogens |
| 6 | The term represents a substance by means of symbols. | F | Water |
| 7 | The term used for the substances formed as a result of a chemical reaction | G | Nitric Acid |
| 8 | A compound containing one atom of zinc and two atoms of chlorine. | H | Products |
| 9 | The chemical name for nitrogen monoxide. | I | Phosphorus |
| 10 | A polyatomic molecule. | J | Zinc Chloride |
Write the names of elements from the following symbol:
Zn
There are ______ number of known elements.
Higher Order Thinking Skills.
List out the metals, non-metals and metalloids which you use in your house, schools. Compare their properties.
Classify the substances given in Fig. 2.2 into elements and compounds
