Basic inorganic Flashcards
Define atom
The smallest unit quantity of an element that may exist either alone or in chemical combination with another element.
What is the mass of a proton?
1.673 x 10^-27 kg
What is the mass of a neutron?
1.675 x 10^-27 kg
What is the mass of an electron?
9.109 x 10^-31 kg
What is the number of protons/electrons in an atom?
The atomic number, z.
What is the number of protons+neutrons in an atom called?
The mass number, A.
What are isotopes?
Forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei.
What is one atomic mass unit called?
A Dalton (Da)
What is the evidence for isotopes?
Mass spectrometry.
How can the emission spectrum of hydrogen be recorded?
By passing an electric discharge through hydrogen gas, splitting the molecules into atoms and exciting electrons. As the excited electrons return to ground state, they emit energy.
What is spectroscopy?
The study of how atoms emit/absorb electromagnetic radiation.
What is frequency and the units?
The number of wavelength crests passing a point per second, s^-1, Hz.
What is the symbol for frequency?
Nu, greek N.
What is the symbol for wavelength?
Lambda.
What is the velocity of light?
C, 2.998x10^8 ms^-1.
