1
JEE Main 2019 (Online) 12th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Among the following, the energy of 2s orbital is lowest in :
A
Li
B
H
C
Na
D
K
2
JEE Main 2019 (Online) 12th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
In comparison to boron, berylium has :
A
lesser nuclear charge and greater first ionisation enthalpy
B
greater nuclear charge and greater first ionisation enthalpy
C
greater nuclear charge and lesser first ionisation enthalpy
D
lesser nuclear charge and lesser first ionisation ethalpy
3
JEE Main 2019 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The element having greatest difference between its first and second ionization energies, is :
A
Ba
B
Ca
C
Sc
D
K
4
JEE Main 2019 (Online) 8th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The IUPAC symbol for the element with atomic number 119 would be :
A
uun
B
une
C
uue
D
unh
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