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प्रश्न
In the modern periodic table, the positions of 1 to 20 elements are shown here. Identify the elements A and B. Write their atomic number.
उत्तर
- Element A is lithium (Li).
Element B is neon (Ne). - Atomic number of element A is 3.
Atomic number of element B is 10.
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संबंधित प्रश्न
In the Modern Periodic Table, which are the metals among the first ten elements?
How many periods and groups are there in the long form of periodic table?
Give two example of group 17 elements.
On which side of the periodic table will you find non-metals?
State whether the following statement is true or false:
On going down in a group of the periodic table, the number of valence electrons increases.
Explain why All the elements of a group have similar chemical properties.
What is the usual number of valence electrons and valency of group 18 elements of the periodic table?
Helium and neon are unreactive gases. What, if anything, do their atoms have in common?
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.
From the standpoint of atomic structure, what determines which element will be the first and which the last in a period the periodic table?
State the term
The tabular arrangement of elements in horizontal rows and vertical columns _________
How many groups and periods does the modern periodic table have?
What do you understand by typical elements?
Write the number of protons, neutrons and electronic configuration of \[\ce{_19^39K, _15^31P}\]. Also state their position in periodic table.
An element barium has the atomic number 56. Look up its position in the periodic table and answer the following question.
Is it larger or smaller than caesium (Cs)?
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?
Give the symbol and valency of the following element and radical.
Oxygen [Oxide]
Give the symbol and valency of the following element and radical.
Nitrate
Give the symbol and valency of the following element and radical.
Sulphate
Give the symbol and valency of the following element and radical.
Sulphite
Give the chemical formula of ammonium sulphate
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.
State whether true or false. If false, correct the statement.
Lanthanides and actinides are kept at the bottom of the periodic table because they resemble each other but they do not resemble with any other group elements.
What are groups and periods in the modern periodic table?
State any five features of modern periodic table.
How does the property vary in periods and in groups?
Which of these belong to the same period?
| Element | A | B | C |
| Atomic number | 2 | 10 | 5 |
On moving from left to right in a period in the periodic table, the size of the atom ______
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 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?
Arrange the following elements in the increasing order of their metallic character
| Mg, | Ca, | K, | Ge, | Ga |
Spot the error:
The elements of group 13 are called the carbon family.
An element belonging to 3d series of modern periodic table has spin magnetic moment = 5.92 B.M. in +3 oxidation state. The atomic number of elements are ______.
An element with atomic number ______ will form a basic oxide.
1H2 is an isotope of hydrogen. In the modern Periodic Table it will ______.
Name the following metal:
A metal present in period 3, group 1 of the periodic table.
Answer the following in respect of element \[\ce{_16^32S}\].
To which group and period does it belong?
Give reason for the following:
Inert gases do not form ion.
