It will be Oxygen . And total 8 protons, 8 electrons and 9 neutrons are present in it.
To calculate the number of atoms of Cr, we first find the number of moles per unit of cubic centimeter of Cr. Then, use avogadros number for the number of atoms. Calculations are as follows:
1 cm^3 (7.15 g/cm^3) (1 mol / 51.996 g Cr) = 0.14 mol Cr
0.14 mol Cr ( 6.022 x 10^23 atoms Cr / 1 mol Cr ) = 8.28 x 10^22 atoms Cr
Explanation:
Fe2o3+ 3co ---------. 2fe + 3co2
D. As more electrons are added to an element, the number of electron orbitals being filled increases
