Question

Choose from the following:; 20Ca, 3Li, 11Na, 10Ne.; (i) An element having two shells completely filled with electrons.; (ii) Two elements belonging to the same group of the periodic table.(All India - 2012)

Answer 1

1. 10Ne
2. Na and Ne

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Answer 2

i) $Ne_{10}$ has two shells completely filled with electrons.

ii) $Li_3$ and $Na_{11}$ are elements belonging to the same group.

Explanation:

i) An element having two shells completely filled with electrons.

• To identify the electronic distribution, the electronic configuration of the given elements must be written.

$Ca_{20} - 1s^22s^22p^63s^23p^64s^2$ - 2, 8, 8, 2

$Li_3-1s^22s^1$ - 2, 1

$Na_{11} - 1s^22s^22p^63s^1$- 2, 8, 1

$Ne_{10}- 1s^22s^22p^6$ - 2, 8

• From the above data it is clear that among the four elements, only Neon has two completely filled shells.

(ii) Two elements belonging to the same group of the periodic table

• The following is the list of elements along with the group in which it is present:

Ca - Second group

Li - First group

Na - First group

Ne - Eighteenth group

• Thus it is inferred that elements such as Lithium (Li) and Sodium (Na) belong to the same group.

Learn more about such concept

Compare and contrast the arrangement of elements in Mendeleev periodic table and Modern Periodic Table

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a) Explain why, the first period of the modern periodic table has only two elements whereas second period has eight elements

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