National 5 chemisrty Flashcards
(45 cards)
whats an ion
a particle like an atom that has lost or gained electronto become stable
what position does the electron have in the atom and what is its charge?
it orbits the nucleus and its charge is -1
what position does the neutron have in the nucleus? and whats its charge
in the nucleus and its charge is 0
what position does the proton have in the nucleus and whats its charge?
in the nucleus and its charge is 1 plus
what does the atomic number equal
Number of protons
what does the mass number equal
number of protons plus neutrons
what does the mass of neutrons equal
the mass number minus the protons
What does delta triangle mean
change in
whats an isotope
an atom of the same element with the same atomic number with a different number of neutrons in there nuclei
what is background radiation
a low level of radiation that that occurs all of the time
what is a source of background radiation
space, the ground
whats a Radioisotope
an unstable nuclei
what is radioactive decay
an unstable nuclei that releases different types of radiation to become stable
what is the 3 different types of radiation
alpha, beta, gamma
what is an alpha particles charge
2 plus
whats a beta particles charge
1 negative
whats a gamma particle charge
0
what is he mass of an alpha particle
4
whats the mass of a beta particle
0
whats the mass of the gamma particle
0
whats half-life
the time it takes for half of the unstable nuclei in a sample to decay or for the activity of the sample to halve or for the count rate to halve
whats a molecule
when two or more atoms chemically bond together and its only with non metals are together
whats an element
a pure substance which is made from only one type of atom
whats a compound
when atoms are from different elements
