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Periodic Puzzler

Horizontales
Two or more atoms combined
This element has a charge of +1 when it bonds and a mass of 39
The law of conservation of matter says that ________ cannot be created or destroyed
Atoms of the same element that have a different number of neutrons
Atoms of the same element that have different numbers of electrons
The atomic mass is the sum of the subatomic particles found here.
Verticales
Two or more atoms from different elements combined
This subatomic particle is positively charged
Horizontal rows on the periodic table
This metalloid has 5 valence electrons and 4 energy shells