<h2>Please mark me as brainliest please yaa!!!^_^</h2>
Number of proton K=19
so, 42 - 19 =23
then the answer in 19 protons and 23 neutrons
86 elections so 43 orbitals
Answer:The molar mass is the mass of a given chemical element or chemical compound (g) divided by the amount of substance (mol).
The molar mass of a compound can be calculated by adding the standard atomic masses (in g/mol) of the constituent atoms.
Explanation:
I think it is C. coefficients but I don't know what subscripts are
