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 The strongest interactions between atoms of helium, He, are examples of

Identify each of the following transformations as a chemical or physical change: burning leaves and melting ice

The formula for a molecule formed from Na and O would be.

What is the name of Na2S?[name1] What is the name of FeCl3?[name2]

The formula for a molecule formed from Aluminum and nitrate would be

Write the correct name for each symbol. A) Cu[element1] B) Ca[element2] 

Give the correct charge for ions of the following elements. O[ion1] S[ion2]

Consider an isotope of sodium with a mass number of 25. The number of neutrons in this isotope of sodium is

Find the number of electrons and neutrons in :  

Water freezes at 100 °C.