How much energy will be given off from the following reaction, if 3.0g of sodium reacts with 1.2g of nitrogen in the following reaction? 2 Na + 3 N2 → 2 NaN3 ΔH = - 42.7 kJ

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?

Draw metallic bonding if two copper

Which electron configuration represents the electrons in an atom of sodium in the ground state at stp