Atom Crossword

Who first suggested the existence of the atom
He found that the rays were attracted by positively charged metal plates but repelled by negatively charged ones.
He did not confirm Thomson's model: used gold foil in experiment.
Electrons ---------------- the positively charged nucleus.
His model postulated the existence of energy levels or shells of electrons.
Believed all matter was made from fire, water, air earth.
Sub-atomic particles found in protons and neutrons.
The number of protons and neutrons in an element is -------.
These sub particles are positive.
The sub particles are negatively charged.
On an atomic model electrons are noted on an electron -----------
Protons plus neutrons equal ---------- ---------
The center of an atom is called the ---------.
The number of electrons is the same as an atom's -------- -----------
To find the number of neutrons in an atom, you ------- the number of protons from the atomic mass number for the element.
Atomic mass is usually a ------ number
Matter -------- ------- be created or destroyed.
Isotopes have the same number of protons but a --------- number of neutrons.
Only ----- electrons can be in the inner most orbit.
Each element has its own --------
This microscope can be used to see an atom
The ------- -------- shows the organization of all known elements
You find the ---------- atomic mass of isotopes to determine atomic weight o that element
The symbol for gold is
The symbol for hydrogen is -----
Calcium has --------- protons.