Naturally occurring iron contains 5.82% 54fe, 91.66 % 56fe, 2.19% 57fe, and 0.33% 58fe. the respective atomic masses are 53.940 amu, 55.935 amu, 56.935 amu, and 57.933 amu. calculate the average atomic mass of iron.

The atomic mass of iron is 55.85 u.

The average atomic mass of Fe is the weighted average of the atomic masses of its isotopes.

We multiply the atomic mass of each isotope by a number representing its relative importance (i.e., its % abundance).

Thus,  

0.0582 × 53.940 u = 3.139 u

0.9166 × 55.935 u = 51.270 u

0.0219 × 56.935 u =  1.247 u

0.0033 × 57.933 u = 0.191 u

TOTAL = 55.85 u

hope this

explanation:

covalent bonds

consist of pairs of electrons shared by two atoms, and bind the atoms to fixed orientation and requre high energies to break them

ionic bonds

when two atoms differ considerably in their electronegativity, then one of the atoms will lose its electron to the other atom. this results in a positively charged ion(cation) and a negatively charged ion (anion)

i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.