periodicity Flashcards
Whats the periodicity of properties
the repetition of pattern in properties from one period to another
whats an atomic radius
the shells are filled with negative electrons that are attracted by the positive protons in the nucleus
As the atomic number increases, the __________________ increases
number of protons and the proton’s attractive force
what happens to the radius of the atom when the number of protons and the proton’s attractive force increases
it shrinks
what is electronegativity
a chemical property that describes the tendency of an atom to attract electrons towards itself
what is chemical reactivity
the ability for an atom to lose/gain electrons
what makes an atom more reactive
if it loses/gains electrons easily
what is chemical reactivity related to
the number of valence electrons and the distance of the valence shell from the nucleus
what does a melting point do throughout a period
increases then decreases
which element is the base of life and science
carbon
what does the atomic number represent
the number of protons in the nucleus of an atom
whats the relative atomic mass
the mass of an atom measured by comparison with a reference element
