I don't know what part you are at, but try the green house or Hagrid's cabin.
snape. his mothers maiden name was prince and he is halfblood. hence the halfblood prince.
yes
Jim Broadbent, the actor who played Horace Slughorn in Harry Potter and the Half-Blood Prince and Harry Potter and the Deathly Hallows.
No. He even returned to Hogwarts inDeathly Hallows, but he is only mentioned briefly
If you mean the memory of professor slughorn telling tom riddle what horcruxes are, that was the sixth harry potter, the half blood prince.
The new Potions teacher is Professor Slughorn
Jim Broadbent
In Harry Potter and the Half Blood Prince Slughorn says he will sell unicorn hairs for 10 galleons each.
Professor Horace Slughorn takes over the position of potions master. Professor Severus Snape becomes the Defence Against the Dark Arts teacher. The following year, Slughorn becomes the Head of Slytherin house after Snape becomes Headmaster.
Professor Slughorn (The headteacher when tom riddle was at hogwarts)
he iin the entrance courtyard, ouside the entrance hall
The name of the new potion teacher in "Harry Potter & the half-blood prince" is Horace Slughorn