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9 Cards in this Set

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Charge: 1.6x10^19 C (1amu)

Atomic number

Denoted by, Z - the number of protons in the nucleus


Number may vary in the nucleus of atoms of the same element.

Similar mass as protons.

Mass number

Denoted by, A

Number of protons and neutrons in nucleus.

Can vary depending on number of neutrons in nucleus of given element , but atomic number (protons) does not vary.

Valence electrons

Electrons in the outermost shell. Experience least electrostatic draw to their nucleus and most likely to bond. Electrons in shells closer to the nucleus are at lower energy level (lower electric potential). Outer electrons are higher in energy.

Atomic mass

Equal to the mass number since protons and neutrons are roughly the same mass

Atomic weight

Mass in grams of one mole of atoms of a given element. Expressed as a ratio of g/lol. 1 mole = 6.022x10^23



Energy emitted as electromagnetic radiation from matter.

h=6.626x10^-34 J•s

f= frequency of radiation

Planck's constant

6.626x10^-34 J•s