What are the 3 sub-atomic particles
Protons, neutrons, and electrons
What is the mass, location and charge of protons neutrons and electrons
Protons - in the nucleus, positive charge (+1), 1 a.m.u.
Neutrons - in the nucleus, neutral charge (0), 1 a.m.u.
Electrons - outside the nucleus, negative charge (-1), 1/2000 a.m.u.
How do atoms become neutral
Because there is an equal amount of positive and negative charges
The atomic number is ….
The number of protons and electrons an atom has
The mass number is …
The number of protons and neutrons added together
How to write nuclide notation for an atom
Mass number top left Chemical symbol in the middle Atomic number bottom left For example lithium: 7 Li 3
How to write nuclide notation for an ion
Mass number top left Charge top right Symbol in the middle Atomic number bottom left For example oxygen with 8p, 10n, and 10e = 18 2- O 8
Define an ion
Ions are forked when an atom looses or gains electrons to make it more stable
Define an isotope
Isotopes are atoms with a different number of neutrons but the same number of protons
How do you calculate the relative atomic mass (r.a.m.)
For example Chlorine 35 and Chlorine 37:
35 37
Cl Cl r.a.m. = (75 x 35) + (25 x 37) ( - over 100)
17 17 = 35.5
75% 25%
What do atoms in the same group of the periodic table have in common
They have similar chemical properties as they have the same number of outer electrons