Atomic mass Ca = 40.078 a.m.u
40.078 g -------------------- 6.02x10²³ atoms
72.8 g ---------------------- ??
72.8 x ( 6.02x10²³) / 40.078 =
4.38x10²⁵ / 40.078 = 1.093x10²⁴ atoms
hope this helps!
Answer:
Nickel(III) oxide is the chemical name of the compound represented by the formula Ni2O3?
Answer:
Beryllium, because it is in period 2 and has four total electrons.
Explanation:
