19.9% of all the isotopes of an element have a mass of 9.93 amu and 80.1% have a mass of 10.94 amu. What is the average mass of this element?

What is the most stable monatomic ion formed from nitrogen

What are the variables in gay-lussac’s law? pressure and volume pressure, temperature, and volume pressure and temperature volume, temperature, and moles of gas

In the following table, all the columns for the element calcium are filled out correctly. element electron structure of atom electron structure of ion net ionic charge calcium 1s22s22p63s23p64s2 1s32s22p63s23p64s1 +1 true false