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प्रश्न
An element ‘M' has 50% of the electrons filled in the 3rd shell as in the 2nd shell. The atomic number of ‘M’ is ______.
पर्याय
10
12
14
18
उत्तर
An element ‘M' has 50% of the electrons filled in the 3rd shell as in the 2nd shell. The atomic number of ‘M’ is 14.
Explanation:
Si has a 14th atomic number and an electrical configuration of 2, 8, and 4. The third shell of silicon is packed with 50% as many electrons as the second shell.
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संबंधित प्रश्न
The atomic numbers of four elements P, Q, R and S are 6, 8, 14 and 16 respectively. Out of these, the element known as metalloid is:
(a) P
(b) Q
(c) R
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Ca, Cl, Na, I, Li, Ba, Sr, K, Br
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(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)
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What is meant in the periodic table by a period?
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Give the symbol and valency of the following element and radical.
Hydroxide
Group 1 and 2 : s block : : group 13 and 18 : _______
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