Mass of an electron is.
9.1 × 10-28g
9.1 × 10-25g
9.1 × 10-10g
9.1 × 10-18g
Number of neutrons in a heavy hydrogen atom is.
0
1
2
3
Which of the following has zero electron affinity?
Oxygen
Fluorine
Nitrogen
Neon
Positive charge is an atom is.
Scattered all over the atom
Concentrated in the nucleus
Revolving around the nucleus
None of these
Which of the following fundamental particles is not deflected by a magnetic field?
Proton
Neutron
Electron
Positron
Which of the following statements is not true?
Most of the space in an atom is empty
The total number of neutrons and protons is always equal
The total number of electrons and protons in an atom is always equal
The total number of electrons in any energy level can be calculated by the formula 2n2
Which of the following electronic configurations represents a noble gas?
2, 8, 2
2, 8 ,6
2, 8
2, 8, 8, 2
Elements having 7 electrons in the valence shell are called.
Halogens
Chalcogens
Alkali metals
Alkaline earths.
Bohr’s model can explain.
Spectrum of hydrogen atom only
Spectrum of any atom or ion having one electron only
Spectrum of hydrogen molecule
Solar spectrum
When the speed of an electron increases, the specific charge.
Decreases
Increases
Remains same
