Answer: number of atoms is 5.21 · 10^24
Explanation: Atomic mass of Be is 9.012 g/mol.
Number of moles n = m/M = 78.0 g / 9.012 g/mol =
Multiply this with Avogadro number Na = 6.022*10^23 1/mol
Nitrogen molecule is diatomic, whereas other elements form tetraatomic molecules.
Make a ball of clay and embed small beads throughout it. The plum pudding model.
Cu(NO3)2>NO2+CuO+O2 balanced: 2Cu(NO3)2=4NO2+2CuO+O2
Ice because the molecules have less movement in solids
