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51. 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 generally on moving from left to right in a period? (NTSE Chandigarh, Stage-I, 2016-17)
Increases
Decreases
Remains the same
First increases then decreases
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52. An element A belongs to third period and second group of the Modern Periodic Table. The number of valence electron/electrons of element A is (NTSE Rajasthan, Stage-I, 2014-15)
One
TWO
Three
Four
53. Among LiCI, RbCI, BeCI2 and MgCI2 which two are the highest and the lowest ionic compounds?
LiCI & RbCI
RbCI & BeCI2
RbCI & MgCI2
MgCI2 & BeCI2
54. The electronic configuration of the atom of an element 'X' is (n - 2)S2 (n - 1 )S2 (n - 1 )p6 ns2np5. If n = 3 the element 'X' is placed in Modern Periodic Table (NTSE Andhra Pradesh, Stage-I, 2014-15)
7th group, 3rd period
17th group, 3rd period
17th group, 5th period
3rd group, 3rd period
55. Which of the given element A, B, C, D and E with atomic number 2, 3, 5, 7 and 30 respectively belong to the same period? (NTSE Chandigarh, Stage-I, 2014-15)
A, Band C
B, C and D
A, D and E
B, D and E
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