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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.
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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
What is meant by a period, in a periodic table?
Which of the following statement about the modern periodic table is correct?
(a) It has 18 horizontal rows known as periods.
(b) It has 7 vertical columns known as periods.
(c) It has 18 vertical columns known as groups.
(d) It has 7 horizontal rows known as groups.
The modern periodic table was prepared by ______.
Which element has the electronic configuration 2, 8, 2?
How would the tendency to gain electrons change on moving from left to right in a period of the periodic table?
How does the chemical reactivity of alkali metals vary on going in group 1 of the periodic table?
State how the valency of elements varies in a group of the periodic table?
What is a period in a periodic table?
What is the fundamental difference in the electron configurations between the group 1 and group 2 elements?
From the standpoint of atomic structure, what determines which element will be the first and which the last in a period the periodic table?
What are the groups in a periodic table? Give two characteristics of each.
The atomic numbers of the three elements X, Y and Z are 2, 6 and 10 respectively.
(i) Which two elements belong to the same group?
(ii) Which two elements belong to the same period?
Give reasons for your choice.
An element X belongs to 3rd period and group 2 of the periodic table. State:
(a) number of valence electrons
(b) valency
(c) metal or non-metal
(d) name of the element
Define:
Periodic table
Name the scientist who stated the modern periodic law.
Name two elements in Alkaline earth metals.
Name the type of elements which have outermost shell complete.
Answer the following in respect of element `31/15 P `
To which group and period does it belong?
How does the electronic configuration of an atom relate to its position in the modern periodic table?
Write the number of protons, neutrons and electronic configuration of \[\ce{_19^39K, _15^31P}\]. Also state their position in periodic table.
What is the number of elements in the 1st period?
Give the symbol and valency of the following element and radical.
Potassium
Give the symbol and valency of the following element and radical.
Oxygen [Oxide]
Give the symbol and valency of the following element and radical.
Hydroxide
State what the group number in the Modern Periodic Table signifies. Give a reason why elements in the same group, have similar valency and similar chemical properties.
State the number of elements in Period 1 of the Periodic Table.
What are the periods in a periodic table?
Group 1 and 2 : s block : : group 13 and 18 : _______
Identify gas A in the following experiment.
On moving from left to right in a period in the periodic table, the size of the atom ______
Which of the following elements does not lose an electron easily?
If an element X is placed in group 14, what will be the formula and the nature of bonding of its chloride?
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
- Write the electronic configuration of element X, given by its symbol as under: \[\ce{^40_20 X}\]
- Determine its position in the modem periodic table.
- What is the nature of its oxide?
- Name one other element of its group.
Give reason for the following:
Inert gases do not form ion.
