3. Name the two major groups,into which elements can be divided, with two exampl

Question

3. Name the two major groups,into which elements can be divided, with two examples of each. 4. List the three different methods of classifying elements 5. Write the symbols for the following metals: iron,zinc, mercury, copper and lead. 6. Write down the names of the elements with the following chemical symbols: H, o, S, K, Mg, Ni, Fe, C, Zn, Cu 7. Give two evidences to prove that hydrogen is an element. 8. Name: i. two elements present in the Earth ii. two elements that exist in the liquid state at room temperature. 9. Classify the following as metals and non-metals: copper, sulphur, oxygen, lead, iron, chlorine, nitroge hydrogen, mercury,carbon, magnesium,calcium 10. Based on which property are elements classified in the periodic table?

Explanation / Answer

Answer the following briefly )

1) Element is a substance that cannot be broken down into simpler substances by chemical means. All of the atoms in a element have same number of protons . 94 elements are found on earth naturally , but totally there are 118 elements

2) oxygen and silicon make up 75 % of earth's crust

Oxygen - 46.6% of earth's crust

Silicon - 27.7% of earth's crust

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