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Why Ar (argon) (at, wt. = 39.94) has bee...

Why `Ar` (argon) (at, wt. `= 39.94`) has been placed before `K` (at. Wt. `= 39.10`) in the periodic table?

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This is because argon (Z=18 ) has lower atomic number than potassium (Z= 19)
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Explain the following: (i) Why argon (atomic mass = 39.94) has been placed before potassium (atomic mass = 39.10) in the Modern periodic table? (ii) There are only 14 anthanides and only 14 actinides in Modern peridoic table.

Explain why hydrogen is best placed separately in the periodic table.

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Element with atomic number 17 has its place in periodic table

Why are lanthanides and actinides place at the bottom of the periodic table?

PRADEEP-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES -Additional Question (very short answer question )
  1. What is the IUPAC name official name and symbol of the element ...

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  2. What are super heavy elements?

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  3. What are the atomic number of the elements which constitute f- b...

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  4. Lanthanoids and actinoids are placed in separate rows at the botto...

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  5. Why Ar (argon) (at, wt. = 39.94) has been placed before K (at. Wt. = 3...

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  6. In terms of electronic configuration, what the elements of a given per...

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  7. Name the groups of elements classified as s- ,p - and d- blocks.

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  8. To Which block (s,p , d or f ) does the element with atomic numbe...

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  9. Which among the following is a transition element?

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  10. Which has a larger radius : (i) Mg or Ca (ii) S or Si

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  11. Compare the size of (a) Na atom with Na^(+) ion (b) Cl atom with C...

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  12. Give four examples of species which are isoelectronic with Ca^(2+...

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  13. Arrange the following ions in order of decreasing ionic radii : ...

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  14. A1 atom loses electrons successively to form A1^(+) ,A1^(2+) and A...

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  15. Which one among the following elements has the lowest first ion...

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  16. Name the element in the table which has the highest and lowest ...

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  17. From amongst Be, B and C, Choose the element with highest and lowe...

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  18. Why is first ionization enthalpy of nigtrogen greater than that ...

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  19. Why are electron gain enthalpies of Be and Mg positive ?

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  20. Which of the following elements has most positive electron gain ...

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