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Composition of Matter

Across
The simplest particle of an element that retains all of the properties of that element.
Atoms of the same element that have a different number of neutrons.
The number of positively charged protons is balanced by an equal number of small, negatively charged particles.
Forms when two atoms share one or more pairs of electrons.
Are the attractive forces that hold atoms together.
An atom or molecule with an electrical charge.
Makes up the bulk of the mass of the atom and consists of two kinds of subatomic particles.
Is the simplest pare to f substance that retains all of the properties of that substance and can exist if a free state.
Positive and negative electrical charges attract each other.
Are substances that cannot be broken down chemically into simpler kinds of matter.
Down
Is the quantity of matter an object has.
Positively charged and part of the nucleus.
The number of protons in an atom.
Anything that occupies space and has mass.
Three-dimensional region around a nucleus that indicates the probable location of an electron.
Is equal to the total number of protons and neutrons of the atom.
Are made up of atoms of two or more elements in fixed proportions.