Introduction to chemistry - Atomic structure Flashcards
what letter represents the atomic number ?
letter “Z”
what rappresents the mass number?
letter “A”
what does the atomic number rapresent ?
the number of protons
what does the mass number represent ?
the number of protons and neutrons
what are isotopes ?
Atoms of the same element with different numbers of neutrons
what are radioactive isotopes ?
Isotopes that decay one time who also become into lighter elements which is radioactivity.
what is an ion?
An atom with an overall electric charge
what happens to the number of protons and electrons in a neutral atom?
the number of electrons equals the number of protons. The charges cancel out
positive ions have more of…..?
protons
negative ions have more of…..?
electrons
what do imbalanced charges do ?
they give electric fields that attract opposite charges and repel like charges
what is the relative mass and the relative charge of proton?
relative mass = 0.9986
relative charge= +1
what is the relative mass and the relative charge of neutron?
relative mass = 1.0000
relative charge = 0
what is the relative mass and the relative charge of electron ?
relative mass = 0.0005
relative charge = -1
equation of charge on an ion
charge on an ion = no. of protons - no. of electrons
