Test: Structure of Atom - NEET MCQ

Atomic no 24 is of Cr. Due to half filled orbital stability it doesnot follow Afbau rule so its configuration is 

The element with atomic number(Z) 17 & mass number (A) 35 is chlorine = 

Mass no. = no. of protons + no. of neutrons.

ψ has no physical significance while ψ2 represnts the probability density of finding an electron.

In anomalous Zeeman effect the splitting of spectral lines occurs due to interaction of the applied magnetic field with the magnetic moment generated by the orbital and 'spin' motions of the electron.

E/m values of particle (α), electron (e) and protons (p) increase in the order α< p < e

It is of boron as it has atomic number 5.

Energy for any n shell = -2.18 x 10⁻¹⁸ )/n^'2 (') stands for raise to the power of therefore, E associated with 5 orbit = -2.18 x 10⁻¹⁸/5² = -2.18 × 10^-18/25 = -218 × 10^-20/25 = -8.72 x 10^-20J/atom

Isobars are the atoms with same mass number but different atomic number.

This is known as shielding effect. Inner lying electrons shields the positive charge reaching the outer most electrons.

In this question l=3 means the sub shell is f & n=4 means it is present in 4^th orbit.
Finally it is a 4f sub shell.
The no of orbital in f sub shell =2l+1
                                                = 2*3+1
                                                =7
Each orbital can accommodate 2 electrons.
  7*2 = 14 electrons.

Maximum number of electrons in a sub shell with l=3& n=4 (4f) is 14electrons.

Energy of orbital is determined by n+l value. The orbital having higher n+l value will have higher energy. If n+l value is same then orbital having higher n value will have higher energy.

Isotopes have same atomic no. but different mass no.

According to Aufbau rule electrons are filled in increasing order of energy.

Radio frequency region is present around 106106 Hz.

It is Krypton .
Electronic configuration:  1s²2s²2p63s²3p64s²3d104p6
​Number of electrons in s orbital are 8
Number of electrons in p orbital are 18
Number of electrons in d orbitals are 10 (18-8=10)

Photoelectric effect proves the particle nature of light.

Paulis exclusion principle stated that no two electron can have same set of all the four quantum nos.

s orbital is spherically symmetrical hence non directional.

For hydrogen atom =  2.18 x 10⁻¹⁸J atom⁻¹ =−E_1(H)

+3 charge means no of electrons will be 3 less than no. of protons. So no. of protons will be 21. So atomic no. is 21.

Emission spectrum is recorded when a electron de excites from higher energy level to ground state.

Dalton’s atomic theory stated that atoms were indivisible. However, the discovery of subatomic particles (such as protons, electrons, and neutrons) disproved this postulate.