What are easy ways to
Study Chemistry ??​

What is a metal replacement reaction

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 substance has a mass of 9.5g and volume of 2.1cm^3