Linus pauling received the Nobel prize for his work on.
Atomic structure
Photosynthesis
Thermodynamics
Chemical bonds
The halogen with smallest electron affinity is
Fluorine
Chlorine
Bromine
Iodine
An atom has mass number 23 and atomic number 11. The atom has _____ electrons, ____ protons and _____neutrons.
11, 12, 13
11, 11, 12
11, 11, 13
11, 14, 15
Mass number of an atom represents the number of.
Protons only
Protons and neutrons
Protons and electron
Neutrons and electrons
Number of neutrons in a heavy hydrogen atom is.
0
1
2
3
In Rutherford’s alpha – ray scattering experiment, the alpha particles are detected using a screen coated with.
Carbon black
Platinum black
Zinc sulphide
Polytetra fluroroethylene
Elements having 7 electrons in the valence shell are called.
Halogens
Chalcogens
Alkali metals
Alkaline earths.
Which of the following electronic configurations represents a noble gas?
2, 8, 2
2, 8 ,6
2, 8
2, 8, 8, 2
The nucleus of an atom has atomic number 17 and mass number 37. There are 17 electrons outside the nucleus. Then the number of neutrons in it is.
20
21
17
37
Positive charge is an atom is.
Scattered all over the atom
Concentrated in the nucleus
Revolving around the nucleus
None of these
