3. Consulting only a Periodic Table, give outer-level configurations for: (a) (b

Question

3. Consulting only a Periodic Table, give outer-level configurations for: (a) (b) (c) the atom with the larger radius, IiNa or 1nMg 23V 3sBr, assuming all electrons have as low energy as possible 4. The electronic energy of the hydrogen atom is given by the expression: n mol For the transition n 3 to n-1, determine: (a) E, in kilojoules per mole (b) , in nanometers: E= 1.196 x 10 kmol (c) Is light absorbed or emitted? What region of the spectrum is it in? Calculate the temperature of H(g) at which the average translational energy, 3RT/2, would be just 8.31J/mol-K) 5. equal to the energy required to raise the electron to its first excited state (n 2). (R Chapte

Explanation / Answer

3.

(a) Na ( Z = 11 ) V.S.E.C is 3s1

Mg ( Z = 12 ) V.S.E.C is 3s2

So, Na has greater radii than Mg because they both belogs to same period.

(b)

V ( Z = 23 ) V.S.E.C is 3d3 4s2

(c)

Br- ( Z = 35 ) V.S.E.C. is 4s2 4p5

4.

(a) deltaE = - 1312 [ ( 1 / 12 ) - ( 1 / 32 ) ] = - 1166 kJ / mol

(b) Wave length = 1.196 * 105 / 1166 = 1.02 * 102 = 102 nm

(c) Light emeitted in UV region.

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