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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:
(i) a noble gas?

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Solution

Group 18 elements are generally called as noble gases. They will have completely filled outermost shells. Here, the elements H and P are the noble gases. This is because, they have the atomic numbers 10 and 18 respectively and hence they have completely filled outermost shells.

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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. 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.

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.

Q. The following diagram shows a part of the periodic table in which the elements are arranged according to their atomic numbers. (The letters given here are not the chemical symbols of the elements):

a 3	b 4		c 5	d 6	e 7	f 8	g 9	h 10
i 11	j 12		k 13	l 14	m 15	n 16	o 17	p 18

(i) Which element has a bigger atom, a or f?
(ii) Which element has a higher valency, k or o?
(iii) Which element is more metallic, i or k?
(iv) Which element is more non-metallic, d or g?
(v) Select a letter which represents a non-metal of valency 2.
(vi) Select a letter which represents a noble gas.

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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:​ (i) a noble gas?​

Group 18 elements are generally called as noble gases. They will have completely filled outermost shells.​ Here, the elements H and P are the noble gases. This is because, they have the atomic numbers 10 and 18 respectively and hence they have completely filled outermost shells.​

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:
(i) a noble gas?

Group 18 elements are generally called as noble gases. They will have completely filled outermost shells. Here, the elements H and P are the noble gases. This is because, they have the atomic numbers 10 and 18 respectively and hence they have completely filled outermost shells.