The sport's governing body said on Tuesday that the seven had all met the "exceptional eligibility criteria" after satisfying the board that they have been training in an environment that passes the necessary anti-doping requirements.
American David Oliver won the gold medal, as favourite Aries Merritt finished a disappointing sixth, in the men's 110 metres hurdles at the World Athletics Championships in Moscow, on Monday.
Russia will not boycott the Rio Olympics after being suspended from the International Association of Athletics Federations over a doping scandal, RIA news agency cited Russian Olympic Committee head Alexander Zhukov as saying on Monday.
Olympic champion Shelly-Ann Fraser-Pryce gave Jamaica a 100 metres double, comfortably winning the women's final in Moscow on Monday. The title favourite never looked troubled as she clocked 10.71 seconds.
Russian pole vaulter Yelena Isinbayeva has applied to world athletics governing body IAAF to compete at the Rio Olympics despite Russia's ban, athletics authorities in Moscow on Thursday. "Isinbayeva sent her application on Wednesday," Alla Glushchenko, the spokeswoman for the Russian athletics federation, told AFP.
The United States is expected to run away with the athletics competition in Rio, taking podium spots often the preserve of Russians such as double pole vault gold medalist Yelena Isinbayeva and 110m hurdles world champion Sergei Shubenkov.
Isinbayeva was under pressure to quit as head of RUSADA's supervisory council after the World Anti-Doping Agency (WADA) called for her removal, one of four steps it said were necessary for RUSADA to retrieve its right to oversee the testing of Russian athletes.
World Athletics, the sport's governing body, limited the number of Russians eligible to compete internationally this year to 10 in response to doping offences by senior staff at Russia's suspended athletics federation.
Women's 100 metres world champion and Diamond Race leader Shelly-Ann Fraser-Pryce won.
China is on track to return to the top of the medals table at the Rio de Janeiro Olympics next year ahead of the United States and Russia, according to a benchmark study released by the Australian Olympic Committee on Wednesday.
Hansle Parchment of Jamaica was second in 13.03 and Olympic champion and world record holder Aries Merritt claimed bronze in 13.04 seconds.
A summary of sports events and sports persons, who made news on Tuesday
Russia was the leading doping offender in global sport during 2014, followed by Italy and India, the World Anti-Doping Agency said on Wednesday.
Dina Asher-Smith seized her golden opportunity to win the World Championship 200 metres on Wednesday and become the first British woman to claim a global sprint title.
A round-up of all the results from the 16th World Athletic Championships in London
Summary of sports events and persons who made news on Friday.
A summary of sports events and sports persons, who made news on Wednesday
