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Elements in the same group have chemica...

Elements in the same group have __ chemical properties. (similar/different).

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To answer the question "Elements in the same group have __ chemical properties. (similar/different)", we can follow these steps: ### Step 1: Understand the Concept of Groups in the Periodic Table - The periodic table is organized into columns called groups. Elements in the same group share certain characteristics. **Hint:** Groups are vertical columns in the periodic table. ### Step 2: Identify Valence Electrons ...
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Answer question numbers 3(a) - 3(d) on the basis of your understanding of the following paragraph and the related studied concepts: Around the year 1800, only 30 elements were known. Dobereiner in 1817 and Newlands in 1866 tried to arrange the then known elements and framed laws which were rejected by the scientists. Even after the ejection of the proposed laws, many scientists continued to search for a pattern that correlated the properties of elements with their atomic masses. The main credit for classifying elements goes to Mendeleev for his most important contribution to the early development of a Periodic table of elements wherein he arranged the elements on the basis of their fundamental property, the atomic mass and also on the similarity of chemical properties. The formula of their hydrides and oxides were treated as basic criteria for the classification of the elements. However, Mendeleev's classification also had some limitations as it could not assign the position to isotopes. He also left some gaps in the periodic table. 3(a) state Mendeleev's Periodic Law. 3(b) Why did Mendeleev leave some gaps in the Periodic table? 3(c) if the letter 'R' was used to represent any of the elements in the group , then the hydride and oxide of carbon would respectively be represented as (i) RH_4 , RO (ii) RH_4 , RO_2 (iii) RH_2 , RO_2 (iv) RH_2 , RO 3(d) isotopes are (i) atoms of an element with similar chemical properties but different atomic masses. (ii) atoms of different elements with similar chemical properties but different atomic masses. (iii) atoms of an element with different chemical properties but same atomic masses. (iv) atoms of different elements with different chemical properties but same atomic masses.

Explain why the elements of the same group exhibit the same chemical behaviour.

ICSE-PERIODIC PROPERTIES OF ELEMENTS -QUESTIONS FOR PRACTICE ( Fill in the blanks by using correct word/term given in the brackets and rewrite the complete sentence in your notebook.)
  1. Period 1 contains elements. (two/eight)

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  2. The elements in a period have valencies. (same/different).

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  3. In the modern periodic table, elements are classified according to the...

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  4. Elements in the same group have chemical properties. (similar/differe...

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  5. As we move across a period from left to right, metallic character (de...

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  6. As we move across a period from left to right, nonmetallic character (...

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  7. The atomic size of lithium is than that of sodium. (greater/smaller).

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  8. Properties of the elements mainly depend on their . (electronic config...

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  9. Fluorine is electronegative than lithium. (more/less)

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  10. Atomic size decreases in a of the periodic table as the atomic number ...

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  11. In a group, the atomic size from top to bottom. (increases / decreases...

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  12. Ionisation energy decreases in a as atomic number increases. (group/p...

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  13. Ionisation energy of sodium is than that of potassium. (more/less)

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  14. If an element of period 2 has one electron in its outermost shell, the...

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  15. The element at the bottom of a group would be expected to show metalli...

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  16. Properties of the elements are a periodic function of their . (atomic...

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  17. The ionisation potential of potassium is ​that of sodium. (gt//lt)

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  18. Write the correct symbol: gt [greater than] or lt [less than] in the ...

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  19. If an element has a low ionisation energy, then it is likely to be . (...

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  20. If an element has seven electrons in its outermost shell then it is li...

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