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प्रश्न
Find the odd one out and give its explanation.
पर्याय
F
K
Cl
I
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उत्तर
K
Explanation:
K is placed in group 1, while others are placed in group 17 of the modern periodic table.
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संबंधित प्रश्न
Fill in the blank:
The modern periodic table consists of ……………. periods.
How does the tendency of elements to gain electrons change as we move from left to right in a period? State the reason of this change.
State modern periodic law.
Fill in the following blank with suitable word:
The horizontal rows in a periodic table are called ...............
How were the positions of isotopes of an element decided in the modern periodic table?
The three elements having chemical symbols of Si, B and Ge are:
(a) all metals
(b) all non-metals
(c) all metalloids
(d) Si is metalloid, B is metal and Ge is non-metal
Consider the following elements:
Na, Ca, Al, K, Mg, Li
Which of these elements belong to the same period of the periodic table?
Give alongside is a part of the periodic table :
As we move horizontally from left to right:
| Li | Be | B | C | N | O | F | |
| Na | Mg | Al | Si | P | S | Cl |
(i) What happens to the metallic character of the elements?
(ii) What happens to the atomic size?
How does the chemical reactivity of alkali metals vary on going in group 1 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 main characteristic of the last elements in the periods of the periodic table? What is the general name of such elements?
What is a group in the periodic table?
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)
Answer the following in respect of element `31/15 P`
Give its electronic configuration
The electronic configuration of an element T is 2, 8, 8, 1.
What is the period number of T?
Define the atomic size.
Give the symbol and valency of the following element and radical.
Bicarbonate
Give the symbol and valency of the following element and radical.
Sulphite
Give the chemical formula of sodium nitrate
Fill in the blank:
The element lithium in the Modern Periodic Table with valency 1+ belongs to the group ______.
What are the periods in a periodic table?
p-block is composed of groups 1 and 2.
Write an explanation.
Period
Write a scientific reason.
Lithium and sodium are included in the same group in the periodic table.
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- 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?
______ is the longest period in the periodical table.
______ and ______ are called inner transition elements.
On moving from left to right in a period in the periodic table, the size of the atom ______
Three elements A, B and C have 3, 4 and 2 electrons respectively in their outermost shell. Give the group number to which they belong in the Modern Periodic Table. Also, give their valencies.
Compare the radii of two species X and Y. Give reasons for your answer.
- X has 12 protons and 12 electrons
- Y has 12 protons and 10 electrons
Group 16 elements are collectively called as ______.
An element with atomic number ______ will form a basic oxide.
Select the appropriate options and complete the following paragraph:
(metals, non-metals, metalloids, four, seven, s-block, p-block, d-block, f-block).
On the basis of electronic configuration, elements in the modern periodic table are classified Into ______ blocks. Groups 1 and 2 elements are included in ______ and all these elements are metals. (except Hydrogen). Group 13 to 18 elements are included in ______. This block contains metals, non-metals and metalloids. Group 3 to 12 elements are included in ______ and all the elements are ______ elements shown at the bottom of the periodic table i.e. Lanthanides and Actinides constitute ______ and all these elements are metals.
Name the metalloids in the first twenty elements.
An element has 2 electrons in its N shell.
Is it a metal or a non-metal?
Match the atomic number with the following:
A rare gas.
Give reason for the following:
Inert gases do not form ion.
