which is true of elements on a periodic table in the same group (family)?
a; elements in the same family have similar chemical properties because they have the same number of electron shells.
b; elements in the same family have similar chemical properties because they have the same number of valence electrons.
c; elements in the same family have few similar properties as they have different numbers of electron shells.
d; elements in the same family are always the same type of elements and have the same number of protons.

Why is permeable soil best for plants that need a lot of drainage?

Calculate the ratio of h+ ions to oh– ions at a ph = 7. find the concentration of h+ ions to oh– ions listed in table b of your student guide. then divide the h+ concentration by the oh– concentration. record this calculated ratio in table a of your student guide. compare your approximated and calculated ratios of h+ ions to oh– ions at a ph = 7. are they the same? why or why not? record your comparison in table a. what is the concentration of h+ ions at a ph = 7? mol/l what is the concentration of oh– ions at a ph = 7? mol/l what is the ratio of h+ ions to oh– ions at a ph = 7? : 1

Precision can be defined as the o exact center of a data set. o reproducibility of a measured value. o correlation between two variables that are measured in a data set agreement between a measured value and an accepted value.