Class 11th

K₁₉ = 1s²2s²2p⁶3s²3p⁶4s¹

For 4s electron

n = 4

l = 0

m = 0

$s=\frac{1}{2}$

Polarisation power µ $\frac{Charge}{Size}$ for K⁺, polarising power is least and ionic character is maximum.

BF₃ : sp² hybridised ->trigonal planar

Kindly go through the solution

Z=109 : Unnilennium->Meitnerium

Sn = [Kr]4d¹⁰5s²5p²

Sn (Z = 50) belongs to p-block element.

: x + 2 (+1) + 3 (–2) + 2 (–1) = 0 x = + 6.

On increasing pressure, equilibrium moves in that direction where number of gaseous moles decreases.

We consider the enthalpy change (delta H) more important than the internal energy (delta U) for practical reasons. When we go by the definitions alone, internal energy is the heat absorbed or released at a constant volume. This only happens in a sealed container. But in real life experiments held at laboratories, we have open vessels like test tubes, and there, only atmospheric pressure as a state variable remains constant, and not volume per se. This condition of constant pressure becomes more useful to calculate enthalpy in the chemical reaction.