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प्रश्न
Find the odd one out and give its explanation.
विकल्प
Carbon
Calcium
Oxygen
Neon
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उत्तर
Calcium
Explanation-
Calcium is a s-block element while others are p-block elements.
APPEARS IN
संबंधित प्रश्न
The position of three elements A, B and C in the Periodic Table are shown below –
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Group 16
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Group 17
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A
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−
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−
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B
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C
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(a) State whether A is a metal or non-metal.
(b) State whether C is more reactive or less reactive than A.
(c) Will C be larger or smaller in size than B?
(d) Which type of ion, cation or anion, will be formed by element A?
Write the names given to the vertical columns and horizontal rows in the Modern Periodic Table. How does the metallic character of elements vary on moving down a vertical column? How does the size of atomic radius vary on moving left to right in a horizontal row? Give reason in support of your answer in the above two cases.
Why do all the elements of the same group have similar properties?
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.
On which side of the periodic table will you find non-metals?
Would you place the two isotopes of chlorine, CI-35 and CI-37 in different slots because of their different atomic masses or in the same slot because their chemical properties are the same? Justify your answer.
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.
Consider the following elements:
Na, Ca, Al, K, Mg, Li
Which of these elements belong to the same period of the periodic table?
Which element has two shells, both of which are completely filled with electrons?
How would the tendency to lose electrons change as we go from left to right across a period of the periodic table?
What is the number of valence electrons in the atoms of first elements in a period?
How do the atomic radii of elements change as we go from left to right in a period of the periodic table?
State how the valency of elements varies 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?
Helium and neon are unreactive gases. What, if anything, do their atoms have in common?
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
Name the type of elements which have outermost shell complete.
Name the type of elements which have two electrons in the outermost orbit.
The electronic configuration of an element T is 2, 8, 8, 1.
What is the period number of T?
Answer the following question.
Define the atomic size. Give its unit of measurement. In the modern periodic table what trend is observed in the atomic radius in a group and a period and why is it so?
Give the symbol and valency of the following element and radical.
Sulphur [Sulphide]
Give the symbol and valency of the following element and radical.
Bicarbonate
Give the symbol and valency of the following element and radical.
Sulphate
Name the following:
The group of the Modern Periodic Table to which calcium [Ca2+] belongs.
State the number of elements in Period 1 of the Periodic Table.
The groups 1 and 2 constitute the _______ block.
______ forms the basis of the modern periodic table.
How does the property vary in periods and in groups?
Element ‘X’ forms a chloride with the formula XCl2, which is solid with a high melting point. X would most likely be in the same group of the periodic table as: ______
The amount of energy released when one or more electrons is added to the neutral atom is ______
An element which is an essential constituent of all organic compounds belongs to
Which of the following elements will form an acidic oxide?
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.
An element has the atomic number 12.
- Write the electric configuration.
- To which group and period does it belong.
Define periods of modern periodic table.
Define groups of modern periodic table.
An element with atomic number ______ will form a basic oxide.
