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प्रश्न
The similarities in the properties of a group of elements are because they have the same ______.
पर्याय
electronic configuration
number of outer electrons
atomic numbers
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उत्तर
The similarities in the properties of a group of elements are because they have the same number of outer electrons.
संबंधित प्रश्न
Define the term : Valency
Which element has twice as many electrons in its second shell as in its first shell?
Fill in the blank in the following statement:
In going across a period (right to left) in periodic table, the atomic size of the atom ...............
The atomic number of an element is 20. In modern periodic table, this element is placed:
(a) 2nd period
(b) 4th period
(c) 3rd period
(d) 1st period
On moving from left to right in a period of the periodic table, the atomic number of elements increases. What happens to the size of atoms of elements on moving from left to right in a period?
(a) increases
(b) decreases
(c) remain the same
(d) first increases then decreases
In each of the following pair, choose the atom having the bigger size:
Na (At. No. 11) or K (At. No. 19)
An element X belong to 4th period and 17th group, state.
no of valence electrons in it
Moving left to right in the second period, the number of valence electrons _____.
Answer the following question:
State the four blocks of the modern periodic table based on the electronic configuration of elements.
There are three elements E, F, G with atomic numbers 19, 8 and 17 respectively.
Classify the above elements as metals and non-metals.
