Most elements are
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How do you know that potassium, an alkali metal, is highly r…
How do you know that potassium, an alkali metal, is highly reactive?
The fact that four emitted wavelengths in the Balmer series…
The fact that four emitted wavelengths in the Balmer series fit a regular pattern was evidence supporting the idea that
The reason a moving object slows down is that its force of m…
The reason a moving object slows down is that its force of motion gradually runs out.
The range of energies emitted by the Sun is most intense nea…
The range of energies emitted by the Sun is most intense near the yellow-green wavelengths.
Litmus dye turns blue in basic solutions.
Litmus dye turns blue in basic solutions.
Covalent bonds involve the transfer of electrons from one at…
Covalent bonds involve the transfer of electrons from one atom to another.
Chemists effectively count atoms by weighing matter.
Chemists effectively count atoms by weighing matter.
J.J. Thomson discovered that cathode rays were really a stre…
J.J. Thomson discovered that cathode rays were really a stream of electrons.
A liquid at 20
A liquid at 20