CBLE REVIEW [INORGANIC]

Barium metal crystallizes in a body-centered cubic lattice with barium atoms only at the lattice points. If the density of barium metal is 3.50 g/cm3, what is the length of the unit cell?

5.7 × 10^-8 cm

He Proposed that light is emitted in discrete energy packets called quanta.

Max Planck

He proposed that light behaves as a stream of particles called photons and explain the photoelectric effect.

Albert Einstein

He proposed and introduced the concept of quantized electron energy levels, proposing that electrons orbit in fixed shells rather than spiraling into the nucleus.

Neils Bohr

Selection Rule Formula: Selection rules are set of rules that depict whether a electronic transition is allowed or forbidden.

dl= +-1 and dml= 0, +-1

Formula in getting the total number of electrons in a shell.

2n²

Formula on getting the total number of orbital in a shell

n²

Formula on getting the total number of orbital in a subshell

2l+1

Formula on getting the total number of electrons in a subshell.

2(2l+1)

Formula on getting the number of angular nodes.

l (azimuthal quantum number)

Formula on getting the radial nodes

n-l-1

Formula for number of exchange energy

N(N-1)/2 [ N- number of electrons with parallel spin]

C). 72: Formula total #e =n² (total of 6p orbitals)

C).

A). 3 [ degeneracy = same shell at energy level n | subshell = n², therefore n=3]

B). [Trick question, you will never find an electron in nucleus]

Formula for de broglie wavelength:

λ=h/mu (m - mass in kg and u - velocity in m/s) [hamisyu]

In the atomic spectra series, this transition corresponds to emission of wavelength at UV region.

Lymann

In the atomic spectra series, this transition corresponds to emission of wavelength at Visible region.

Balmer

Acronym for atomic spectra series

LaBaPaBaPfaHa ( Lymann, Balmer, Pacschen, Brackett, Pfund, Humphrey)

An electron in 3p will have an allowed transition to the following subshell:

I. 4s

II. 3d

III. 2p

IV. 4f

I and II only

Ions that have red/red shade metal ion flame test

Li, Ra, Sr

Ion that has Red-Violet flame test

Rb

Ion that has a purple flame test.

K, Cs

Ions that have yellow flame test

Na, Fe

Ions that have green flame test

Ba, B, Sb

Ion that have blue flame test

Cu,

B).

A). [Concept of diamagnetic and paramagnetic]

A).