Question

which of the following statements is true? choose 1 answer: a magnesium is in period 2 and manganese is in group 4. b magnesium has the symbol mn and manganese has the symbol mg. c magnesium has an atomic mass of 24.31 amu and manganese has an atomic mass of 54.94 amu. d both are considered alkaline earth metals. show periodic table

Explanation:

Magnesium (Mg) has an atomic mass of approximately 24.31 amu and manganese (Mn) has an atomic mass of about 54.94 amu. Magnesium is in period 3 and group 2 (alkaline - earth metal), while manganese is in period 4 and group 7. The symbol for magnesium is Mg and for manganese is Mn. Only option C has correct atomic - mass information.

Answer:

C. Magnesium has an atomic mass of 24.31 amu and manganese has an atomic mass of 54.94 amu.