Indo European Languages - The K Sound and the S Sound

Early linguists noted that most of the indo european languages have a word for hundred that begins with a k sound, like the latin word kentum. The germanic languages are an exception because the k had shifted to an h sound. But there was another whole group of Indo-European languages spoken primarily in asia and eastern europe where the word for hundred began with an s sound. So they concluded that this division probably represented an early division of the into european tribes. With those in the east developing the shift from the k sound to the s sound the western languages were called the kentum languages after the latinword kentm. And the