For an element to have an allotropic form it must have
a) more than one oxygen atom in its chemical formula.
b) the ability to exist in more than one phase at room temperature.
c) 4 electrons in its valence shell, so that it can easily gain or lose electrons
d) two or more forms with different bonding structure in the same physical phase.
d
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LR Circuits: A 1.5-H inductor is connected in series with a 200-? resistor through an ideal 15-V dc power supply and an open switch. After closing the, what is the maximum energy that will be contained in the inductor?
A. 1.2 mJ B. 2.2 mJ C. 3.2 mJ D. 4.2 mJ E. 5.2 mJ
Nebular theory predicts that other solar systems that formed in the same way should also have 8 planets
Indicate whether the statement is true or false
In a color television tube, electrons are accelerated through a potential difference of 20,000 volts. With what velocity do the electrons strike the screen?
What will be an ideal response?
An atom has completely filled inner shells and a single valence electron in an excited p state. The filled inner shells have an orbital momentum equal to zero. What is the magnitude of the orbital angular momentum L of the atom?
A) 1.0? B) 1.2? C) 1.4? D) 1.7? E) 2.0?