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प्रश्न
Position of A, B and C three elements is given in the table from the modern periodic table. Answer the following questions.
| Periods | Group 2 | Group 17 |
| 2 | ----- | A |
| 3 | B | ----- |
| 4 | ----- | C |
- What is A element metal or nonmetal?
- Which is the outermost orbit of element B?
- Identify C element and it's physical state.
उत्तर
- Element is A is Non-metal.
- Outermost shell of element B is M.
- Element C is bromine (Br) and it exists in a liquid state.
संबंधित प्रश्न
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.
Write the merits of the modern periodic table over Mendeleev’s Periodic table
Name the scientist who first of all showed that atomic number of an element is a more fundamental property than its atomic mass.
Fill in the following blank with suitable word:
Group 18 elements are called ...............
The atomic numbers of four elements P, Q, R and S are 6, 8, 14 and 16 respectively. Out of these, the element known as metalloid is:
(a) P
(b) Q
(c) R
(d) S
What is the number of valence electrons in the atoms of first elements in a period?
Explain why All the elements of a group have similar chemical properties.
What is a group in the periodic table?
What are the periods in a periodic table? Give two characteristics of each.
Give the group number of following elements present in periodic table
Name two elements in Inert gas.
Name two elements in each case:
Transition element
Answer the following in respect of element `31/15 P`
Give its electronic configuration
The horizontal rows in a periodic table are called _____.
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.
Sodium
Give the symbol and valency of the following element and radical.
Calcium
Give the symbol and valency of the following element and radical.
Sulphur [Sulphide]
State the number of elements in Period 1 of the Periodic Table.
Find the odd one out and give its explanation.
To the left of the zig-zag line in the periodic table are the metal elements.
Write scientific reason.
Lithium and sodium are included in the same group in periodic table.
______ is the longest period in the periodical table.
______ and ______ are called inner transition elements.
In the modern periodic table, elements are arranged according to their ______
An element which is an essential constituent of all organic compounds belongs to
The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively. The mass of Y is approximately equal to the average mass of X and Z. What is such an arrangement of elements called as? Give one example of such a set of elements.
If an element X is placed in group 14, what will be the formula and the nature of bonding of its chloride?
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 ______.
1H2 is an isotope of hydrogen. In the modern Periodic Table it will ______.
Name two elements that you would expect to show chemical reactions similar to calcium. What is the basis of your choice?
An element has 2 electrons in its N shell.
State its position in 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.
A group of elements in the periodic table is given below (Boron is the first member of the group and Thallium is the last).
Boron, Aluminium, Gallium, Indium, Thallium
Answer the following question in relation to the above group of elements:
If the electronic configuration of aluminium is 2, 8, 3, how many electrons are there in the outer shell of thallium?
