Most reactive metals belonging to group I of the periodic table are Sodium and Potassium. Their symbols are “Na” and “K”.
Electron dot structure – valence electrons are represented by dots placed around the chemical symbol. Electrons are placed up to two on each side of the elemental symbol for a maximum of eight, which is the number of electrons in a filled s and p shell. We place a single electron on each side before pairing them up (this is related to Hund’s rule). Period one (hydrogen and helium) represents an exception where only a maximum of two electrons are placed on one side of the element.
Electron dot structure for sodium:
Reaction of Na with halogen (eg: Chlorine)
Formation of sodium chloride:
STEP 1: Formation of cation-
STEP 2: Formation of anion-
STEP 3: Formation of NaCl-
Properties of NaCl:
• This compound is a solid and is somewhat hard because of strong force of attraction between the positive- positive ions. It is generally brittle and breaks into pieces when pressure is applied.
• NaCl has high melting and boiling point because a considerable amount of energy is required to break the strong inter-ionic attraction.
• It is generally soluble in water.
• It conducts electricity in molten state because the movement of ions is possible.
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