ATOMS! Crossword

Atoms contain a dense ___________surrounded by a cloud of electrons, which contain a negative charge.
Nearly ________ hundred percent of the mass of an atom is contained in the nucleus.
The number of _____________ in the atom will determine its chemical element
In 1661, Robert Boyle first published the theory that all matter was composed of _____________
Every element has at least ______ isotope
The isotopes undergo radioactive decay due to their unstable _________
The word "atom" comes from the Greek word for ____________
You have around _________ billion billion billion atoms in your body
the basic unit of a chemical element
here are about ___ sextillion atoms of oxygen in a drop of water.
Every year your body replaces about _____ of its atoms.
An atom represents the smallest part of an _________ that can exist by itself
The larger the___________ of an atom the smaller its size
Protons and __________ have about 2,000 times more mass than an electron
Each shell can hold a different number of ______________