Which of the following fundamental particles is not deflected by a magnetic field?
Proton
Neutron
Electron
Positron
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
Which of the following particles is the heaviest?
Meson
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
Which of the following has zero electron affinity?
Oxygen
Fluorine
Nitrogen
Neon
When the speed of an electron increases, the specific charge.
Decreases
Increases
Remains same
None of these
Positive charge is an atom is.
Scattered all over the atom
Concentrated in the nucleus
Revolving around the nucleus
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 firmness with which an electron is held by an atom is a measure of its.
Electronegativity
Ionisation potential
Ionic character
Metallic character
