Write the electron configurations for the following atom and ion. (show full configuration.)

(a) Mg²⁺ (Z=12, magnesium ion)

(b) Sc (Z=21, scandium)

Solutions

Expert Solution

19)

(a) Mg²⁺

1s²2s²2p⁶

Mg have 12 electron (Z = 12)

but when Mg²⁺ formed Mg loose 2 electron and remain electron are 10 and electronic configuration as shown above.

(b) Sc

1s²2s²2p⁶3s²3p⁶4s²3d¹

Scandium have 21 electron and its electronic configuration as shown above

electrons filled by increasing energy 3d have more energy than 4s electron therefore 4s subshell filled first then filled 3d subshell.

queen_honey_blossom answered 2 years ago

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