My 1234 is an atmospheric condition

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I am eight letters long - “12345678”
My 1234 is an atmospheric condition.
My 34567 supports a plant.
My 4567 is to appropriate.
My 45 is a friendly thank-you.
My 678 is a man’s name.
Q: What word am I?

Click here for Answer

MISTAKEN
1234 - MIST
34567 - STAKE
4567 - TAKE
45 - TA
678 - KEN