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प्रश्न
Distinguish between:
Group 17 - Group 18
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उत्तर
| Group 17 | Group 18 | |
| 1. | Elements of group 17 are called halogens. | Elements of group 18 are called inert gas elements or noble gases. |
| 2. | They have seven valence electrons. | They have eight valence electrons except helium which contains 2 electrons. |
| 3. | Their valency is 1. | Their valency is zero. |
| 4. | They form diatomic molecules with general formula (X2). | They are monoatomic gases under normal conditions. |
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संबंधित प्रश्न
Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the Periodic Table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?
Write the merits of the modern periodic table over Mendeleev’s Periodic table
How were the positions of isotopes of an element decided in the modern periodic table?
How does the chemical reactivity of alkali metals vary on going in group 1 of the periodic table?
Explain why All the elements of a group have similar chemical properties.
Helium and neon are unreactive gases. What, if anything, do their atoms have in common?
From the standpoint of atomic structure, what determines which element will be the first and which the last in a period the periodic table?
What are the periods in a periodic table? Give two characteristics of each.
What are the groups in a periodic table? Give two characteristics of each.
Which of the following are the correct characteristics of isotopes of an element?
(i) same atomic mass
(ii) same atomic number
(iii) same physical properties
(iv) same chemical properties
(a) (i), (ii) and (iv)
(b) (ii), (iii) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)
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 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 latter which represents a metal of valency 2.
(vi) Select a letter which represents a non-metal of valency 2.
Consider the following elements:
20Ca, 8O, 18Ar, 16S, 4Be, 2He
Which of the above elements would you expect to be:
(i) very stable?
(ii) in group 2 of the periodic table?
(iii) in group 16 of the periodic table?
Name the type of elements which have outermost shell incomplete.
Answer the following in respect of element `31/15 P `
To which group and period does it belong?
What is the main characteristic of the last element in each period of the periodic table?
An element barium has atomic number 56. Look up its position in the periodic table and answer the following question.
What will be the formula of its phosphate?
The electronic configuration of an element T is 2, 8, 8, 1.
What is the period number of T?
What is meant in the periodic table by a period?
From the standpoint of atomic structure, what determines which elements will be the first and which the last in a period of the periodic table?
Answer the following question.
How it can be proved that the basic structure of the Modern Periodic Table is based on the electronic configuration of atoms of different elements?
Give the symbol and valency of the following element and radical.
Hydrogen
Give the symbol and valency of the following element and radical.
Aluminium
Give the symbol and valency of the following element and radical.
Chlorine [Chloride]
Give the symbol and valency of the following element and radical.
Nitrate
Give the chemical formula of sodium sulphite
Fill in the blank:
The element lithium in the Modern Periodic Table with valency 1+ belongs to the group ______.
Name the following:
The group of the Modern Periodic Table to which calcium [Ca2+] belongs.
How were elements arranged in the long form of the periodic table or the Modern Periodic Table?
Compare Modern Periodic Law with Mendeleev's Periodic Law.
The d-block elements are called as _______ elements.
The K and L shells of the elements Na and Mg contain electrons.
An X element with atomic number 11 and Y element with atomic number 13 belongs to the third period in the modern periodic table. With this information, give the answers of the below questions.
- Which element has more metallic character from these two elements?
- What is the valency of each X and Y elements?
- Atom size of Y element is smaller than atom size of X element. Explain.
In the modern periodic table, elements are arranged according to their ______
Which of the given elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively belong to the same period?
Give the criteria on the basis of which elements are placed (i) in a group and (ii) in a period in the modern periodic table. The atomic number of an element is 16. According to the criteria, in which group and period it should be placed?
