Which type of element has the following general properties: solid at room temperature, high luster, good conductor of heat and electricity, malleable and ductile?

Current enters a circuit at a: 1.positive terminal 2.negative terminal 3.low potential side 4.resistor

In an experiment, how can i change human errors? be specific.

In a classical model of the hydrogen atom, the electron moves around the proton in a circular orbit of radius 0.053 nm. what is the electron's orbital frequency? what is the effective current of the electron?