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RADS1101 Ch. 2 Structure of Matter

Across
___________ experiment showed that the atom was composed of a nucleus with an electron cloud.
The periodic table of the elements was developed by __________
An atom that loses or gains one or more electron
The binding energies, or energy levels, of electrons are represented by their ___________.
The shell number of an atom is called __________
The smallest particle that has all the properties of an element
The chemical element is determined by the number of __________ in the atom.
Two identical atoms which exist at different energy states
Down
A positively charged nucleus surrounded by negatively charged electrons in well-defined orbits is the ___________ of the atom.
An atom in a normal state has an electrical charge of _______.
The first person to describe an element as being composed of identical atoms
The term “atom” was first used by the ___________.
Least penetrating form of ionizing radiation.
The only difference between x-rays and gamma rays
One of the fundamental particles of an atom
When an atom has the same number of protons as another, but a different number of neutrons