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.

20) what is a magnetic field? 21) in which direction do magnetic field lines always point? 22) sketch a diagram showing how a plotting compass points around a 23) name two magnetic poles that will: a) attract each other b) repel each other. 24) explain why you can use a compass to navigate. 25) what's an electromagnet? 26) list two ways to increase the strength of an electromagnet. 27) the wire in a simple motor feels a force when a current flows through it. why is this? i need answers to check mine