Adaptive Practice
Atomic Structure
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Easy
Who proposed the planetary model of the atom?
Easy
What is the charge and relative mass of a neutron?
Easy
The atomic number of an element is 17. How many electrons are present in its neutral atom?
Medium
Which of the following represents the correct electronic configuration of chlorine (Z=17)?
Easy
Calculate the number of neutrons in an atom of sodium-23 (Na-23).
Medium
Which statement correctly describes isotopes?
Medium
What is the maximum number of electrons that can be accommodated in the third shell (n=3)?
Medium
Which quantum number determines the shape of an atomic orbital?
Hard
The wavelength of an electron moving with a velocity of 2.0 × 10⁶ m/s is approximately (mass of electron = 9.11 × 10⁻³¹ kg, Planck's constant h = 6.626 × 10⁻³⁴ Js):
Hard
Which of the following is NOT a valid set of quantum numbers for an electron in an atom?