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Ch 3: Building Blocks of Matter

Name: _______________________________

Date: ____________________
Across
The law that states that mass cannot be created or destroyed in ordinary chemical and physical changes.
An atom that is identified by the number of protons and neutrons in its nucleus.
The mass in grams of 1 mol of a substance.
6.02 X 10^23, the number of atoms or molecules in 1 mol.
The law that states that a chemical compound always contains the same elements in exactly the same proportions by weight or mass.
The SI base unit used to measure the amount of a substance whose number of particles is the same as the number of atoms of carbon in exactly 12 g of carbon-12
The number of protons in the nucleus of an atom; this is the same for all atoms of an element.
Down
The law that states that when two elements combine to form two or more compounds, the mass of one element that combines with a given mass of the other is in the ratio of small whole numbers.
A unit of mass that describes the mass of an atom or molecule; it is exactly 1/12 of the mass of a carbon atom with mass number 12 (abbreviation: u)
The smallest unit of an element that maintains the chemical properties of that element.
The interaction that binds protons and neutrons, protons and protons, and neutrons and neutrons together in the nucleus.
An atom that has the same number of protons (or the same atomic number) as other atoms of the same element but that has a different number of neutrons (and thus a different atomic mass).
The sum of the numbers of protons and neutrons that make up the nucleus of an atom.