Explain giving examples, the colour of nf electrons is about the same

1.	Explain giving examples, the colour of nf electrons is about the same as those having (14-n) electrons.
Answer» (1) Consider Pr³⁺ and Tm³⁺ ions. Tm³⁺ (4f¹²) has nf electron 12 electrons. Pr²⁺ (4f²) has (14 – n) = (14 – 2) = 12 electrons. Both, Tm³⁺ and Pr³⁺ are green. (2) Consider Nd³⁺ and Er³⁺ ions. Er³⁺ (4f¹¹) has nf electrons 11. Nd³⁺ (4f³) has (14 – n) is (14 – 3) = 11 electrons. These both ions Er³⁺, Na³⁺ are pink in colour.

Explain giving examples, the colour of nf electrons is about the same as those having (14-n) electrons.

Answer»

(1) Consider Pr³⁺ and Tm³⁺ ions. Tm³⁺ (4f¹²) has nf electron 12 electrons. Pr²⁺ (4f²) has (14 – n) = (14 – 2) = 12 electrons. Both, Tm³⁺ and Pr³⁺ are green.

(2) Consider Nd³⁺ and Er³⁺ ions. Er³⁺ (4f¹¹) has nf electrons 11.

Nd³⁺ (4f³) has (14 – n) is (14 – 3) = 11 electrons. These both ions Er³⁺, Na³⁺ are pink in colour.

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Explain giving examples, the colour of nf electrons is about the same as those having (14-n) electrons.

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