The word missing is ionic. Ionic compounds are soluble to water. They are soluble because water is a polar molecule. Water has a positive end and a negative end. These ends attract ionic compounds. However, not all ionic compounds are able to dissolve in water.
Answer:
long-term exposure to air pollution can contribute to the development of some lung conditions
photosynthesis
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Answer:
Q2->They all form acids when combined with hydrogen. They are all fairly toxic. They readily combine with metals to form salts.
Q3->Because their outermost orbit is complete. In Mendeleev's original periodic table there was no place reserved for noble gas. They were discovered in end of 19th century. So Mendeleev created zero group without disturbing original periodic table.
Explanation:
The beginning of the Cambrian Period is marked by the evolution of hard body parts such as calcium carbonate shells. ... These body parts fossilize more easily than soft tissues, and thus the fossil record becomes much more complete after their appearance.
