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A part of s-block in the modern periodic...

A part of s-block in the modern periodic table is given here. The correct arrangement of these atoms in the increasing order of there atomic size is

A

Na, Mg, K

B

K, Na, Mg

C

Mg, Na, K

D

Na, K, Mg

Text Solution

Verified by Experts

The correct Answer is:
C
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Three elements 'X', 'Y' and 'Z' have atomic numbers 7, 8 and 9 respectively. (i) State their positions (Group number and period number both) in the Modern Periodic Table. (ii) Arrange these elements in the decreasing order of their atomic radii. (iii) Write the formula of the compound formed when 'X' combines with 'Z'.

The position of eight elements in the modern periodic table is given below where atomic numbers of elements are given in the parenthesis. (i) Write the electronic configuration of Ca. (ii) Predict the number of valence electrons in Rb. (iii) What is the number of shells in Sr ? (iv) Predict whether K is a metal or a non-metal. (v) Which one of these elements has the largest atom in size ? (vi) Arrange Be, Ca, Mg and Rb in the increasing order of the size of their respective atoms.

Knowledge Check

  • The correct arrangement for the ions in the increasing order of their radii is

    A
    `Na^(+), Cl^(-), Ca^(2+)`
    B
    `Ca^(2+), K^(+), S^(2-)`
    C
    `Na^(+), Al^(3+), Be^(2+)`
    D
    `Cl^(-), F^(-), S^(2-)`

  • The correct arrangement for the ions in the increasing order of their radii is

    A
    `Na^(+), Cl^(-),Ca^(2+)`
    B
    `Ca^(2+),K^(+), S^(2-)`
    C
    `Na^(+),Al^(3+),Be^(2+)`
    D
    `Cl^(-),F^(-),S^(2-)`

  • The correct arrangement for the ions in the increasing order of their radii is

    A
    `Na^(+) , Cl^(-), Ca^(+2)`
    B
    `Ca^(+2), K^(+) , S^(-2)`
    C
    `Na^(+) , Al^(+3) , Be^(+2)`
    D
    `Cl^(-),F^(-), S^(-2)`

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