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How are the elements arranged in the modern periodic table?
in order of increasing atomic number from left to right and top to bottom
What happens during radioactive decay?
the atomic nuclei of unstable isotopes release fast moving particles and energy called radiation
What happens to the reactivity of metals as you move from left to right across the periodic table?
Properties of Alkali metals
very reactive, very soft, never found uncombined in nature, shiny, malleable, react violently with water
an atom with the same number of protons and a different number of neutrons from other atoms of the same element
What are the seven diatomic particles?
Hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine, iodine
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