Which of the following is an anion?

a. o2–
b. mg2+
c. al3+
d. h

Balance this equation: n2 + h2 > nh3, write the following molar ratios: n2 / n2 / nh3 h2 /

What is the ima of the 1 st class lever in the graphic given? 2 3 0.5

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?