Question

calculate the number of electrons present in M shell of chlorine in 142 g of chlorine

Answer 1

Hey dear here is your answer!!!!!!!!!

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⭐We know that Chorine atomic no. is 17 ⭐

Therefore it has following configuration;

⏪2,8,7
⏪Therefore it has 8 electrons in its M shell .

⭐Hope it helps u dear...⭐⭐

Answer 2

the electronic configuration of chlorine is 1s² 2s² 2p⁶ 3s² 3p⁵

we know that M shell is the 3rd shell

⇒ each chlorine atom contains 7 electrons in its M shell

we know that 1 mole of chlorine weighs 35.5 grams

⇒ 4 moles of chlorine weighs of chlorine weights 142 grams

we know that 1 mole of chlorine contains 6.023 × 10²³ atoms

⇒ 4 moles of chlorine contains 24.092 × 10²³ atoms

142 grams of chlorine contains 24.092 × 10²³ atoms and as stated each atom of chlorine contains 7 atoms in its M shell

⇒ 142 grams of chlorine contains 24.092 × 7 × 10²³ electrons in its M shell

⇒ 142 grams of chlorine contains 1.6822 × 10²⁵ electrons in its M shell.