The atomic number of an element is the total number of which particles in the nucleus?
neutrons
protons
electrons
protons and electrons
4. all atoms of the same element have the same
a. number of neutrons
b. number of protons
c. mass numbers
d. mass
5. isotopes of the same element have different
a. positions on the periodic table
b. chemical behavior
c. atomic numbers
d. mass numbers
Answers: 1
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Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)
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High-pressure liquid chromatography (hplc) is a method used in chemistry and biochemistry to purify chemical substances. the pressures used in this procedure range from around 500 kilopascals (500,000 pa) to about 60,000 kpa (60,000,000 pa). it is often convenient to know the pressure in torr. if an hplc procedure is running at a pressure of 1.03×108 pa , what is its running pressure in torr?
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The atomic number of an element is the total number of which particles in the nucleus?
neutr...
neutr...
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