Defintions Flashcards
to re-learn the basics CAPE stylee
Atomic number
Number of protons in the nucleus of an atom.
Mass number
the sum of the numbers of protons and neutrons in the nucleus of an atom.
Isotopes
atoms of the same element with the same number protons but different number of neutrons are called isotopes.
Relative Atomic Mass
the Ar of an element is defined as the mass of one atom of an element relative to 1/12th of the mass of one atom of carbon-12.
Relative Isotopic Mass
this is the mass of a particular isotope of an element, on a scale where an atom of carbon-12 has a mass of exactly 12 units.
Electrons
1/1837
-1
energy levels
mass first
Protons
1
+1
inside nucleus
mass first
Neutrons
1
0
inside nucleus
mass first
Behaviour of the subatomic particles in an electric field.
depends on mass.
protons will move around for a while before they are deflected, because its mass is 1.
electrons are light, so as soon as they move, they will be deflected.
neutrons go any which way, float/move around.
The electron is deflected to the positive end of the electric field very easily since it is lighter than the proton.
The proton takes some time before it is deflected because of its heavy mass.
In this case, mass=distance
Radioactivity/Radioisotopes
Some nuclei of atoms are unstable and decay spontaneously, this is called radioactivity. When atoms disintegrate by radioactivity, they emit alpha-particles, beta particles, and gamma rays.
an alpha particle
An alpha particle (fancy x) is known as a doubly charged Helium nuclei, 4/2 He 2+ (insert alpha symbol above the He)
a beta particle
A beta particle B is known as an electron, -1e (insert 0 on top of the 1)
gamma rays
Gamma rays (fancy, curled Y) are known as electromagnetic waves and are unaffected by a magnetic field.
how to spell the p word
precipitate
