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Periods in periodic table
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How many groups period in periodic table?
18 groups
Elements of same group have similar properties?
They have similar physical and chemical properties.
Say one trend in periodic table.
electronegativity, ionization energy, electron affinity, atomic radius, melting point, and metallic character
How many trends in periodic table?
electronegativity, ionization energy, electron affinity, atomic radius, melting point, and metallic character
What is the potassium's group name(special name).
alkali metal, lithium family
What is the state of sodium in 20*C?
solid
The first period conatains which elements?
hydrogen and helium
Elements in 3 period typically follow the so-called -
octet rule
Elements in which period have valence electrons in the 7s, 5f, 6d and 7p orbitals.
Period 7
What are the rare earth element?
Lanthanides
What is period in periodic table?
horizontal rows


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