Intro to Atoms

region where electrons are likely to be found

Democritus described atoms as

The mass number is

Isotopes have the same number of ______ as the other atoms of the same element, but a different number of _____.

central region of the atom

Which of the following scientists contributed to the atomic theory?

In the plum pudding model, the ____ are located throughout the atom like plums in a pudding.

particle in the center of an atom that has no charge

The electrons in an atom have the the least mass.

The nucleus of the atom has the most mass.

negatively charged particle discovered by Thomson

the smallest particle into which an element can be divided and still be the same substance

subatomic particle that has a positive charge

the number of protons in the nucleus of an atom

atom that has the same number of protons but different number of neutrons

a unit of mass that describes the mass of an atom

the sum of protons and neutrons in an atom