How many grams do 5.4 × 1020 atoms of neon
weigh?
Answer in units of g.

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

What is the mass of phosphorous in a 51-kg person

What is the oxidation state of each individual carbon atom in c2o42−?