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Rutherford’s planet like structure was defective and unsatisfactory because_________________?
A. Moving e- accelerate towards the nucleus B. Continuous spectrum C. behavior of electron remain unexplained D. all Submitted by…
Which one is not true about cathode rays ?
A. 9.11×1-31 Kg B. Cast shadow C. Heat up the platinum foil D. Cannot ionize Submitted by :- Jamil Ahmed
When an atom absorbs energy the lines in the spectrum will appear which are_________________?
A. Brighter B. Darker C. Colourless D. Hard to locate Submitted by :- Jamil Ahmed
When electron jump into orbit 1 then series obtained is___________________?
A. Lyman B. Paschen C. Pfund D. Brackett Submitted by :- Jamil Ahmed
Spectrum is produced due to________________?
A. Different wavelength B. Different colours C. Different intensities D. all have little contribution Submitted by :- Jamil Ahmed
All are periodic properties excluding ____.
Ionization energy Electronegativity Dipole moment Electron affinity Submitted by :- Muhammad Nawaz
The element whose electronic configuration is 1s2, 2s2, 2p6, 3s2, 3p6, 3d10, 4s2 is a
Metal Non-metal Noble gas Metalloid Submitted by :- Muhammad Nawaz
Which of the mentioned elements is more metallic?
P As Sb Bi Submitted by :- Muhammad Nawaz
In the modern periodic table, the period indicates the value of
Atomic number Atomic mass Principal quantum number Azimuthal quantum number. Submitted by :- Muhammad Nawaz
An element with atomic number 20 is placed in which period of the periodic table?
4 3 2 1 Submitted by :- Muhammad Nawaz