Question

In the graphic X represents which element? 31 15 11x А B 31 Gallium 15 Phosphorus P 46 Palladium Pd Ga​

Answer 1

B. X represents phosphorus

Step-by-step explanation:

In an isotope symbol, you write the mass number above the atomic number. So the 31 represents the mass of the protons and neutrons of the element added together, and the 15 represents the atomic number or the total number of protons in the nucleus.