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Which two elements of the following be...

Which two elements of the following belong to the same period ? A1 , Si , Ba and O.

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A1 and Si.
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Given below are some elements of the modern periodic table : ""_(4)Be, ""_(9)F,""_(14)Si,""_(19)K,""_(20)Ca (i) Select the element that has one electron in the outermost shell and write its electronic configuration. (ii) Select two elements that belong to the same group. Give reason for your answer. (iii) Select two elements that belong to the same period. Which one of the two has bigger atomic size ?

PRADEEP-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES -Additional Question (very short answer question )
  1. State the modern periodic law.

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  2. What are horizontal rows and vertical columns of the periodic tabl...

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  3. Which two elements of the following belong to the same period ? A1...

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  4. What is the IUPAC name official name and symbol of the element ...

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  5. What are super heavy elements?

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

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

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

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

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

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

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  12. Which among the following is a transition element?

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

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

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

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

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

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

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

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

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