Chemistry - ionic radius trends

what creates an ion?

removal of an electron

electron repels all of the other electrons, repulsion forces what?

electrons in the outer shell farther from the nucleus

more protons than electrons means what

more attraction

shells have a bigger factor in what

size

group

elements with similar chemical properties in a vertical column

Period

horizontal row, properties change from metallic on the left to nonmetallic on the right

staircase line

separates metals (L) from nonmetals (R)

mendeleev periodic table is based on

atomic mass

modern periodic table is based on

atomic number

Mendeleev periodic law

elements arranged in order of increasing atomic mass show a periodic recurrence of properties at regular intervals

Modern periodic law

when the elements are arranged in order of increasing atomic number, their properties show a periodic recurrence and gradual change

empirical knowledge

knowledge coming directly from observations

theoretical knowledge

knowledge based on ideas to explain observations

law of conservation of mass

mass of all the reactants has to equal the mass of all the products

law of conservation of composition

compounds always have the same percentage composition by mass