What is Period 3 on the periodic table?
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Regarding this, what do Period 3 elements have in common?
ATOMIC AND PHYSICAL PROPERTIES OF THE PERIOD 3 ELEMENTS It covers ionisation energy, atomic radius, electronegativity, electrical conductivity, melting point and boiling point.
Subsequently, question is, what is a period in a periodic table? A period in the periodic table is a row of chemical elements. All elements in a row have the same number of electron shells. Arranged this way, groups of elements in the same column have similar chemical and physical properties, reflecting the periodic law.
Just so, why is sodium in Period 3 of the periodic table?
These low melting and boiling points are typical of non-metals. Argon, chlorine, sulfur and phosphorus are non-metals. On the left hand side of period 3 we find the elements sodium, magnesium and aluminium. The high melting points suggest that the force of attraction between the "atoms" making up the solids are strong.
Does Period 3 have 5 valence electrons?
Phosphorous is the 5th element from the left in the third period so it has five valence electrons.