Period 3 Flashcards
Across period 3 the atomic radius…
Decreases
Across period 3 the electronegativity…
increases
Across period 3 the 1st ionisation energy…
Increases
Except from Al (p-orbital) + S (e- removed in paired)
Across period 3 the melting point…
Increases until Al
Na (s) + H2O (l) —>
Mg (s) + H2O (l) —>
Mg + H2O (g) —>
Cl (s) + H2O (l) —>
Cl (s) + H2O (l) —> bright sunlight
Na (s) + O2 (g) —>
Mg (s) + O2 (g) —>
Al (s) + O2 (g) —>
Si (s) + O2 (g) —>
P (s) + O2 (g) —>
S (s) + O2 (g) —>
Observation when Na is burned in O2?
Orange flame
White solid
Observation when Mg is burned in O2?
Bright white flame
White solid
Observation when Al is burned in O2?
Al Powder = bright white flame
White solid
Observation when Si is burned in O2?
Orange flame
Pure form of SiO2 = White solid
Observation when P is burned in O2?
White Phosphorous = White flame
White fumes
Observation when S is burned in O2?
Pale blue flame
Colourless gas
