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प्रश्न
Give the number of the group and the period of elements having three shells with three electrons in valence shell.
उत्तर
Three shells indicate that the element belongs to the third period.
Three valence electrons indicate that the element belongs to the third group.
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संबंधित प्रश्न
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
Correct the statements.
Elements in the same periods have equal valency.
What is the common feature of the electronic configuration of the elements at the end of period 2, and period 3?
'In a group, the atomic radii increase with increasing period number', explain this statement and justify it with reference to group 17.
What is the common feature of electronic configurations of the elements at the end of period 2 and period 3?
Atomic number of an element is 16. State
- the period to which it belongs
- the number of valence electrons
- whether it is a metal or non-metal
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.
Fill in the blanks from the words A to F given below.
A: Decreases
B: Increases
C: Remains same
D: Increases by one
E: Electropositive
F: Electronegative
Down a group in the Modern Periodic Table.
No. of electron shells __________; No. of valence electrons ________; Electronegativity ________ Character of elements changes from _________ to ____________.
Chlorine 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?
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. |
