Atomic and Electron Structure Flashcards

Flashcards about Atomic and Electron Structure.

Atom Radius

Radius of an atom is about 0.1 nm on average.

Neutral Atom

Atoms are neutrally charged when the number of neutrons and protons are the same.

Proton

Positive charge, same mass as a neutron.

Electron

Nearly nothing in mass, negative charge.

Neutron

Neutral charge, some mass as proton.

Atomic Number

Number of protons equals the number of electrons.

Mass Number

Number of protons plus number of neutrons.

Group Number (Periodic Table)

Shows how many outer shells it has.

Period Number (Periodic Table)

Shows how many electron shells there are.

Isotope

An element with the same number of protons but a different number of neutrons. They have the same atomic number but different mass numbers.

Unstable Isotopes

Some isotopes are unstable and as a result decay and give off radiation.

Ar (Relative Atomic Mass)

% of Isotope A x mass of isotope A / 100 + % of Isotope B x mass of isotope B / 100