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In the Modern Periodic Table, elements w...

In the Modern Periodic Table, elements with similar valenceshell configuration are placed in

A

same group

B

different groups

C

same period

D

none of above

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The correct Answer is:
A
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Modern periodic table is based on

The electrons in the atoms of four elements A, B, C, and D are distributed in three shells having 1,3,5, and 7 electrons in their outermost shell respectively. State one period in which these elements can be placed in the Modern Periodic Table. Write the electronic configuration of the atoms A and D and molecular formula of the compound when A and D combine.

a] Write the trend of atomic size and metallic character along a group and a period in the Modern Periodic Table. b]"Elements in the periodic table show periodicity of properties." List any four such properties.

An element 'X' (Atomic number = 20) burns in the presence of oxygen to form a basic oxide. (i) Identify the element and write its electronic configuration. (ii) State its group number and period number in the Modern Periodic Table. (iii) Write a balanced chemical equation for the reaction when this oxide is dissolved in water.

In the Modern Periodic Table, which are the metals among the first ten elements?

An element 'X' belongs to third period and second group of the Modern Periodic Table. (i) Write its electronic configuration. (ii) Is it a metal or non-metal? Why? (iii) Write the formula of the compound formed when 'X' reacts with an element (a) Y of electronic configuration 2, 6 and (b) Z with electronic configuration 2, 8, 7.

a] Why are sodium and chlorine placed in the same period in the Modern Periodic Table? b] Why do elements placed in the same group of the periodic table have similar chemical properties? c] Who proposed the modern periodic law? On which fundamental property of an atom is it based?

The longest period in the Modern Periodic Table is the

The electronic configuration of an element 'X' is 2, 8, 8, 2. To which (a) period and (b) group of the Modern Periodic Table does 'X' belong? State its valency. Justify your answer in each case.

ZEN PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-ZEE ADDITIONAL QUESTIONS SECTIONS (MULTIPLE CHOICE QUESTIONS)
  1. Which element was not known when Mendeleev framed the periodic table?

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  2. Chemical properties of elements depend on

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  3. Which of the following properties of the elements can't be predicted f...

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  4. Non-metals usually form

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  5. In the Modern Periodic Table, elements with similar valenceshell confi...

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  6. Elements in the same group of the periodic table have the same

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  7. Which of the following always increases down a group?

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  8. Which of the following always decreases down a group?

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  9. Which parameter decreases as we move from left to right along a period...

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  10. The number of valence electrons in an element belonging to period 3 an...

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  11. The period and group number of an element with atomic number 7 are

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  12. The number of which of the following atomic particles plays a major ro...

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  13. The longest period in the Modern Periodic Table is the

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  14. Group I elements in the Modern Periodic Table are known as

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  15. The most reactive element of all the elements is

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  16. According to Newlands' law of octaves, the number of elements between ...

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  17. Halogens are present in which group of the Modern Periodic Table?

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  18. The 18th group of elements in the periodic table is called

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  19. The electronic configuration of element x is 2, 8, 8, 1 and the electr...

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  20. The number of groups and periods in the modern periodic table respecti...

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