An atom has atomic number 5 and mass number 11. how many neutrons does the atom have? 5 6 10 11

Write the empirical chemical formula of calcium with a mass percent of 38.8, phosphorus with a mass percent of 20.0, and oxygen with a mass percent of 41.3.

The valence of aluminum is +3, and the valence of the chlorine is -1. the formula fir the aluminum chloride is correctly written as

Identify arrows pointing to bonding electrons. done h-0-0-h ) intro