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Standard XII

Chemistry

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Question

The question refers to the elements of the periodic table with atomic numbers from 3 to 18. In the table below, some of the elements are shown by letters, but letters are not the usual symbols of the elements.

Which of these is: (iii) an alkali metal?

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Solution

Alkali metals are group 1 elements. They generally have one electron in their outermost shell. Here, A and I are alkali metals. This is because, they have the atomic numbers 3 and 11 respectively and hence they have one electron in their outermost shell.

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Similar questions

In the table below, some of the elements of the periodic table with atomic numbers from 3 to 18 are given. These are represented by letters, which are not the usual symbols of the elements. [5 MARKS]

3	4	5	6	7	8	9	10
A						E	G
11	12	13	14	15	16	17	18
B	C		D			F

1. Which of these is a noble gas?

2. Which of these is a halogen?

3. Which of these is an alkali metal?

4. Which of these is an element with valency 4?

5. If A combines with F, what would be the formula of the resulting compound? What is the electronic arrangement of G?

Q. The diagram below shows a part of the skelecton of the periodic table in which elements are indicated by letters which are not their usual symbols.
Which one of the following statement is correct?

Q. In this ladder, symbols of elements are jumbled up. Rearrange these symbols of elements in the increasing order of their atomic number in the periodic table.

Question 46
(a) In this ladder (Figure 5.2) symbols of elements are jumbled up. Rearrange these symbols of elements in the increasing order of their atomic number in the Periodic Table.

(b) Arrange them in the order of their group also.

Q. Question 44 (c)
Atomic number of a few elements are given below 10, 20, 7, 14. Identify the periods of these elements in the Periodic Table.

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Standard XII Chemistry

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The question refers to the elements of the periodic table with atomic numbers from 3 to 18. In the table below, some of the elements are shown by letters, but letters are not the usual symbols of the elements.​ Which of these is:​ (iii) an alkali metal?​

Alkali metals are group 1 elements. They generally have one electron in their outermost shell. ​ Here, A and I are alkali metals. This is because, they have the atomic numbers 3 and 11 respectively and hence they have one electron in their outermost shell.​

The question refers to the elements of the periodic table with atomic numbers from 3 to 18. In the table below, some of the elements are shown by letters, but letters are not the usual symbols of the elements.

Which of these is: (iii) an alkali metal?

Alkali metals are group 1 elements. They generally have one electron in their outermost shell. Here, A and I are alkali metals. This is because, they have the atomic numbers 3 and 11 respectively and hence they have one electron in their outermost shell.