Which determines the reactivity of an alkali metal? its boiling and melting points

the shininess of its surface

the number of protons it has

its ability to lose electrons
HURRY IM ON A TIME LIMIT

Look at the picture below . what does this picture represent ?

Match the following terms describing electrical events with the correct phases of the cardiac cycle. the ventricular muscle cells depolarize at the start of this phase. during this phase, na+ entry through the funny channels causes the pacemaker potential of sa nodal cells to gradually become less negative until it reaches threshold. the ventricular muscle cells repolarize right before this phase. the cytosolic concentration of calcium in the contractile cells of the ventricle is highest during this phase. a. isovolumetric relaxation b. ventricular ejection c. isovolumetric contraction d. ventricular filling

What does the positioning of transcription factors determine?