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A substance that cannot be broken down into simplier substances by chemical and physical means

Atomic number

number of protons in the atom's nucleus.

energy level

Reagons that electrons are located in


atoms with the same of protons but different6 of nuetrons

mass number mass protons + neutrons


...a substance that is consists of two or more elements that are chemicaly combined.

chemical bond

Forces that hold atoms together...


an atom that has am electrical charge bc of a gain or loss of one or more electrons.

ionic bond

an atom that gains electrons become negativly charged.

covalent bond

when atoms shere electrons

metallic bond

electrons ar eshared by metal and ions

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