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प्रश्न
Find the odd one out and give its explanation.
पर्याय
Carbon
Calcium
Oxygen
Neon
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उत्तर
Calcium
Explanation-
Calcium is a s-block element while others are p-block elements.
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संबंधित प्रश्न
Fill in the following blank with suitable word:
Group 18 elements are called ...............
Name the scientist who prepared modern periodic table.
Which element has two shells, both of which are completely filled with electrons?
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?
Explain why All the elements of a group have similar chemical properties.
Explain why, the first period of the periodic table has only two elements whereas second period has eight elements
What is the main characteristic of the last elements in the periods of the periodic table? What is the general name of such elements?
(b) What is the number of elements is 3rd period, the modern periodic table?
Helium and neon are unreactive gases. What, if anything, do their atoms have in common?
Name the type of elements which have outermost shell incomplete.
Name the type of elements which have two electrons in the outermost orbit.
State its position in the periodic table?
Arrange the elements of second and third periods in increasing order of their atomic size.
Third Period.
The electronic configuration of an element T is 2, 8, 8, 1.
What is the group number of T?
Name an alkali metal in period 3 and halogen in period 2.
How will the tendency to gain electrons change as we go from left to right across a period? Why?
Write a short note.
Position of isotopes in the Mendeleev’s and the modern periodic table.
In the Modern Periodic Table – atoms of all elements are arranged according to their increasing order of – atomic numbers. An atom of nitrogen has seven protons and seven electrons. State what would be its atomic number.
Give the symbol and valency of the following element and radical.
Nitrate
Give the chemical formula of sodium nitrate
Give the chemical formula of magnesium nitrate
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 modern periodic table is divided into which blocks?
Write scientific reason.
There was ambiguity about the correct position of hydrogen in Mendeleev’s periodic table.
Write scientific reason.
Lithium and sodium are included in the same group in periodic table.
Explain structure of modern periodic table in short.
______ forms the basis of the modern periodic table.
______ and ______ are called inner transition elements.
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?
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.
Name the metalloids in the first twenty elements.
Name the following metal:
A metal present in period 3, group 1 of the periodic table.
Give reason for the following:
Inert gases do not form ion.
