Neutrons are found in atoms of all elements except in
chlorine
oxygen
argon
hydrogen
D.
hydrogen
Hydrogen is the only element which has no neutrons. In case of hydrogen atomic number and atomic weight is nearly same.
The atomic weight of an element is 39. The number of neutrons in its nucleus is one more than the number of protons. The number of protons, neutrons and electrons-respectively in its atoms would be
19, 20, 19
19, 19, 20
20, 19, 19
20, 19, 20
Out of the following electronic configurations the one of a transition element, is
1s2, 2s2 2p6, 3s2 3p6 3d10, 4s2 4p6
1s2, 2s2 2p6, 3s2 3p6 3d3, 4s2
1s2, 2s2 2p6, 3s2 3p6, 4s2
1s2, 2s2 2p6, 3s2 3p6 3d10, 4s2 4p1
A covalent bond between two atoms is formed by which of the following?
Electron nuclear attraction
Electron sharing
Electron transfer
Electrostatic attraction
Hybridisation involves
addition of an electron pair
mixing up of atomic orbitals
removal of an electron pair
separation of orbitals
Which of the following compounds in liquid state does not have hydrogen bonding?
H2O
HF
NH3
C6H6