Chapter 2; Atomic Structure and Radioisotopes Flashcards
elements…
consist of only one type of atom, and cannot be broken down into anything smaller
compounds ..
consists of more than one type of atom, and can be broken down into their elements by chemical means
atoms..
consist of a small, very dense nucleus containing protons and neutrons, surrounded by electrons that are rapidly moving
electron cloud is..
the region where electrons are more likely to be found
mass of atoms expressed as relative units
atomic mass units (amu) or daltons (Da)
protons (+1) and neutrons (zero charge) are located in the …
nucleus
electrons (-1) are located in the
electron cloud
subatomic particle
Charge and mass
proton
neutron
electron
+1 1.007
0 1.009
-1 0.000559
mass of an atom is compromised of…
protons and neutrons
volume of an atom
determined by electrons
charge of an atom
determined by number of protons and electrons
atomic symbol…
abbreviation assigned to each element
atomic number…
number of protons
atomic mass
average mass of the atoms of an element
what are group elements
going down on periodic table
what are periods
going across periodic table
what can too much fluoride cause
bones and teeth brittle
+
enlarged thyroid
atomic number =
protons and electrons
how to find neutrons
mass - atomic # (protons)
all atoms of an element
- contain the same number of protons and electrons
- may contain different numbers of neutrons
isotopes …
are atoms with the same number of protons but different number of neutrons
(different forms of a single element)
how to identify mass number with isotopes (diff neutrons)
mass # = # protons +# neutrons
how to name an isotope with its name
element name-mass number
e.g. iodine-125