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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
What is periodicity in properties of elements with reference to the Modern Periodic Table?
Why do all the elements of the same group have similar properties?
Fill in the following blank with suitable word:
Group 18 elements are called ...............
Which of the following statement is correct in regard to the classification of elements?
(a) Elements in modern periodic table are arranged on the basis of increasing atomic masses.
(b) Elements in Mendeleev's periodic table are arranged on the basis of increasing atomic numbers.
(c) In modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass.
(d) In modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.
Which element has two shells, both of which are completely filled with electrons?
How does the chemical reactivity of the halogens vary on going in group 17 of the periodic table?
How do the atomic radii of elements change as we go from left to right in a period of the periodic table?
What is the fundamental difference in the electron configurations between the group 1 and group 2 elements?
In what respects do the properties of group 1 elements differ from those of group 17 elements? Explain with examples by taking one element from each group.
What are the periods in a periodic table? Give two characteristics of each.
The elements A, B, C and D belong to groups 1, 2, 14 and 17 respectively of the periodic table. Which of the following pairs of elements would produce a covalent bond?
(i) A and D
(ii) C and D
(iii) A and B
(iv) B and C
(v) A and C
Define:
Periodic table
Name the metals in the first twenty elements.
State its position in the periodic table?
The electronic configuration of an element T is 2, 8, 8, 1.
What is the group number of T?
Name the noble gas with 3 shells.
What would be the correct order if Zn, Fe, Al and Cu are arranged in increasing order of reactivity?
State the modern periodic law.
What is meant in the periodic table by a period?
Name an element of group 18 which can form compounds.
Name the cation and the anion in the salt – calcium sulphate
Give the symbol and valency of the following element and radical.
Sodium
Give the chemical formula of sodium bicarbonate
Give the chemical formula of sodium sulphite
State what the group number in the Modern Periodic Table signifies. Give a reason why elements in the same group, have similar valency and similar chemical properties.
Group 13 to 18 : p block : : _______ : d block
Explain structure of modern periodic table in short.
State any five features of modern periodic table.
The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?
The amount of energy released when one or more electrons is added to the neutral atom is ______
The inert gas which lies in the third period is ______
What is the symbol of the element Tungsten?
Which one of the following elements exhibit maximum number of valence electrons?
Arrange the following elements in the increasing order of their metallic character
| Mg, | Ca, | K, | Ge, | Ga |
Choose an element from period 3 of modern periodic table that matches the description given below in instance. Give a reason for your choice.
It has variable valency and is a member of the Oxygen family (group 16).
______ group elements are called alkaline earth metals.
- Write the electronic configuration of element X, given by its symbol as under: \[\ce{^40_20 X}\]
- Determine its position in the modem periodic table.
- What is the nature of its oxide?
- Name one other element of its group.
Name the non-metals in the first twenty elements.
Match the atomic number with the following:
A rare gas.
