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.

Aphoton is absorbed by an electron that is in the n = 3 state of a hydrogen atom, causing the hydrogen atom to become ionized. very far away from the nucleus, the released electron has a velocity of 750,000 m/s. what was the wavelength of the absorbed photon?

What is friction? how does it affect the motion of an object?

On a mild saturday morning while people are working inside, the furnace keeps the temperature inside the building at 23degreesc. at noon the furnace is turned off, and the people go home. the temperature outside is a constant 16degreesc for the rest of the afternoon. if the time constant for the building is 3 hr, when will the temperature inside the building reach 18degreesc? if some windows are left open and the time constant drops to 2 hr, when will the temperature inside reach 18degreesc?