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Choose from the following : ""(20)Ca,"...

Choose from the following :
`""_(20)Ca,""_(3)Li, ""_(11)Na, ""_(10)Ne`
(i) An element having two shells completely filled with electrons.
(ii) Two elements belonging to the same group in the periodic table.

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(i) The element is `""_(10)Ne , 2, 8`
(ii) The elements are `""_(3)Li,and""_(11)Na" , "Li(2,1)" , "Na(2,8,1).`
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DINESH PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-Very Short Answer Questions
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  2. Three elements X, Y and Z belong to 17th group but to 2nd, 3rd and 4th...

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  3. Element 'Y' with atomic number 3 combines with element 'A' with atomic...

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  4. Name two other elements which belong to the same family as (i) fluor...

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  5. On the basis of the periodic classification, identify each set belongi...

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  6. The formula of magnesium oxide is MgO. Write the formula of magnesium ...

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  7. The electronic configuration of an element is 2, 8, 7. What is its exp...

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  8. Two elements A and B belong to rhe same period. What is common in them...

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  9. The electronic configuration of an element is 2, 8, 6. Identify the el...

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  10. How would tendency to gain electrons change as you go down a group ?

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  11. Why do elements present in a group show similar characteristics after ...

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  12. Given below are some of the elements of first group Li, Na, K (Their...

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  13. An element has electronic configuration 2, 8, 3. What is the atomic nu...

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  14. The atomic numbers of three elements X, Y and Z are 9, 11 and 17 respe...

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  15. Choose from the following : ""(20)Ca,""(3)Li, ""(11)Na, ""(10)Ne (...

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  16. Given below are the atomic radii of some elements of second period. ...

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  17. Would you place the two isotopes of chlorine, Cl-35 and Cl-37 in diffe...

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  18. The electronic configuration of an element 'X' is 2, 8, 8, 2. To which...

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  19. Write the number of vertical columns in the modern periodic table. Wha...

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  20. Why are elements H, Li, Na and K placed in group 1 ?

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