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प्रश्न
What is the number of elements in the 3rd period, of the modern periodic table?
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उत्तर
There are eight elements in the third period.
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संबंधित प्रश्न
What is meant by a group, in a 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?
Which of the following are the correct characteristics of isotopes of an element?
(i) same atomic mass
(ii) same atomic number
(iii) same physical properties
(iv) same chemical properties
(a) (i), (ii) and (iv)
(b) (ii), (iii) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)
Name two elements in each case: Lanthanides
The electronic configuration of an element T is 2, 8, 8, 1.
What is the period number of T?
The horizontal rows in a periodic table are called _____.
Give the symbol and valency of the following element and radical.
Bicarbonate
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.
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
Answer the following in respect of element \[\ce{_16^32S}\].
- Give its electronic configuration.
- To which group and period does it belon?
- What is its valency?
- Is it a metal or a non-metal?
- Is it a reducing agent or an oxidising agent?
- Give its formula with hydrogen.
