In the latest airstrikes, four members of the same family were killed in Gaza City. They were identified as Muhammad Shehadeh Hajjaj, 31, Fayzeh Saleh Hajjaj, 66, Rawan Ziad Hajjaj, 15, and Yousef Muhammed Hajjaj, 28.
Earlier, two elderly women were killed in Rafah, southern Gaza. Medics identified them as Hakema Nafe Abu Odwan, 75, and Najah Nafe Abu Odwan, 85.
Four Palestinians were killed in al-Bureij refugee camp and Hasan Shabaan Khamase, 28, was killed in al-Maghazi camp in central Gaza.
Ahmed Asad al-Badde, 24, was killed in Beit Lahiya and the bodies of Tarek Fayek Hajjaj, 22, and Ahmed Ziad Hajjaj, 21, and Mosaab Nafeth Ejla, 30, were pulled from rubble in the al-Shujaiyeh neighborhood, which suffered heavy bombing on Sunday.
Earlier, the bodies of 65-year-old Muhammad Khalil Ahel and Hamada Eleiwa were found in the Gaza City neighborhoods of Shajaiyeh and Zaytoun.
Another man was killed in an airstrike on Beit Lahiya, while three people died in shelling on the al-Tuffah neighborhood of Gaza City.
Before that, al-Qidra said 22-year-old Mahmoud Salim Mustafa Daraj succumbed to his wounds in Jabalia refugee camp in the northern Gaza Strip.
At least four Palestinians were killed in Gaza City overnight, Muna Rami, four, was killed in northern Gaza, and over a dozen civilians were killed in shelling on Rafah, Deir al-Balah, and Gaza City.
On Tuesday morning, civil defense crews with a crane parked outside the Salam building in Gaza City, which was hit in an Israeli air strike.
The tower block's top five floors had collapsed onto its bottom four floors. The leg of a person was visible from the street, lying on a piece of rubble caked with streams of dried blood.
Early Tuesday, the Israeli army said another two of its troops had been killed in clashes in Gaza a day earlier, raising Monday's toll to nine soldiers.
The army also said the remains of one of 13 soldiers killed in Gaza on Sunday had not been identified, indicating that all or part of the body was missing.
Overall, 27 soldiers have died in the past four days, with 13 killed on Sunday alone in what was the bloodiest single day for the Israeli military since the Lebanon war of 2006.
Since the offensive, more than 100,000 Gazans have fled their homes, seeking shelter in 69 schools run by the Palestinian refugee agency UNRWA.
AFP contributed to this report