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प्रश्न
Name or state following with reference to the elements of the first three periods of the periodic table.
A metalloid in period 2 and in period 3.
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उत्तर
Metalloid in period 2 is B (Boron) and in period 3 is Si (Silicon)
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संबंधित प्रश्न
The atomic masses of three elements A, B and C having similar chemical properties are 7, 23 and 39, respectively.
- Calculate the average atomic mass of elements A and C.
- Compare the average atomic mass with atomic mass of B.
- What could the elements A, B and C be?
Rewrite the following statement after correction, if necessary:
Elements in the same period have equal valency
In terms of electronic configurations, explain the variation in the size of the atoms of the elements belonging to the same period and same group ?
The atomic numbers of the elements Na, Mg, K and Ca are 11, 12, 19 and 20 respectively. The element having the largest atomic radius is:
(a) Mg
(b) Na
(c) K
(d) Ca
Chorine in the periodic table is surrounded by the elements with atomic number 9, 16, 18 and 35.
Which of these have physical and chemical properties resembling chlorine.
On the basis of electronic configuration, how will you identify the first and the last element of a period?
The elements of one short period of the periodic table are given below in order from left to right:
| Li | Be | B | C | O | F | Ne |
To which period do these elements belong?
Name or state following with reference to the element of the first three periods of the periodic table.
A metal in period 3 having valency 3.
State the following:
The group which contains highly electropositive metals including sodium.
Match the option A and B with the statements (i) and (ii):
| A. metal | (i) The metal that forms two types of ion. |
| B. iron | (ii) An element with electronic configuration 2, 8, 8, 3. |
