Which statements accurately describe dmitri mendeleev’s contributions to the development of the periodic table? check all that apply.
mendeleev wrote the first modern chemistry textbook.
mendeleev produced the first orderly arrangement of known elements.
mendeleev ordered the elements by increasing atomic number.
mendeleev used patterns to predict undiscovered elements.
mendeleev accounted for variations resulting from isotopes.

22. the top of a cliff is located a distance h above the ground. at a distance h/2 there is a branch that juts out from the side of the cliff, and on this branch a bird's nest is located. two children throw stones at the nest with the same initial speed, one stone straight downward from the top of the cliff and the other stone straight upward from the ground. in the absence of air resistance, which stone hits the nest in the least amount of time?