How many Keyword in a article SEO ?

Hi all !
Please tell me How many Keyword in the article is good to SEO ?
Thanks !

3 Long tail keywords
5 Broad match keywords

Use these long tail keywords and broad match keywords in product information, Quotes, feature description and in image title. Hope this will help you. Complete content on a landing page should contain 300 words.

One blog says one keyword per page and residuals or secondary should follow.

It depends on the word count of an article. On an average 2-3 keywords are considered to be best.

You should use keywords 2-3 times per article. If you use keywords more than 3 times, then it will be considered a Black Hat SEO technique.

It is not fix number for keywords to use in article.
Just do not repeat the keywords in same article for more than 2 or 3 times.
Target phrases for anchor links and not the keywords all the time.
Useful and relevant to the most searches keywords targeting content will be great help to rank fast in Search engines.

there is no fixed limit but 2-3 keyword should be used in artical submission

I think minimum 2 or 3 keywords include your articles

Your question is all about keyword density. For a 500 words article use 3-5% keywords which are considered as a normal usage of keywords.

It depend upon your article word, every 100 words contains 2 keywords.

My opinion is 3 or 4 keywords

You can use 2-3 keywords.

Keywords are included based on the length of an article(i.e) number of words used. For better SEO result prepare the content with 1930 words.

Usually it depends on the length of the article but if you use 2 or 3 keyword then it is quite better for seo purpose.