What does the atomic number of an atom tell us? How much the atom weighs

The number of protons in the atom

Which column the element is in on the periodic table

The number of electrons it is likely to lose

Iron reacts with sulfur to form iron sulfide. if 60 grams of iron reacts with sulfur to produce 90 grams of iron sulfide, how much sulfur has been used in the chemical reaction?

Which of the following is not a part of the respiratory system? a. pharynx b. trachea c. pancreas d. larynx

Karen is running forward at a speed of 9 m/s. she tosses her sweaty headband backward at a speed of 20 m/s. the speed of the headband, to the nearest whole number relative to a stationary observer watching karen