As you know that too much of keyword density will probably getting banned.So what should be the keyword density for an article like 400-500 worlds. need ur suitable reply...
Write for your visitors and don't obsess over keyword density. Stay under 7 - 8% and you should be fine.
It is not important. One of the great SEO myths is that Google uses keyword density as a metric. Another of the great SEO myths is that Google uses LSI. - Michael