One In The Greek

[Michael The Disciple]

Help needed.

Can someone tell me if there is any difference in Greek between these words "one" in Greek from our English Bibles?

Mark 12:29

29And Jesus answered him, The first of all the commandments is, Hear, O Israel; The Lord our God is one Lord:

1 Tim. 2:5

5For there is one God, and one mediator between God and men, the man Christ Jesus;

John 10:30

I and my Father are one.

1 John 5:7-8

7For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one. 8And there are three that bear witness in earth, the spirit, and the water, and the blood: and these three agree in one.

Appreciate the help!