Trends in Period 3 Flashcards
What elements from group 1, 2 and 3 are across Period 3?
magnesium, sodium and aluminium
What are the properties of elements from group 1, 2 and 3 across Period 3?
-metals
-giant structures
-lose outer electrons
What element from group 4 is across Period 3?
silicon
What qualities does the group 4 element across Period 3 have?
-semi metal
-forms 4 covalent bonds
-giant structure
What elements from group 5,6 and 7 are across Period 3?
phosphorous, sulfur and chlorine
What qualities do the elements from group 5,6 and 7 across Period 3 have?
-non metals
-accept electrons to form ionic compound
-donate electrons for covalent compound
What element from group 0 is across Period 3?
argon
What properties does the group 0 element across Period 3 have?
-noble gas
-full outer shell
-unreactive
What is the trend in melting and boiling points across Period 3?
highest to lowest
Al > Si > Mg > Na > P > S > Cl > Ar
Why does the melting/boiling point increase from Na > Mg > Al?
-greater nuclear charge
-greater attraction to sea of delocalised electrons
-bonds stronger
Why has silicon got a higher melting/boiling point than sodium?
has giant structure
What is the melting/boiling point of sulfur, phosphorous and chlorine dependent on?
size of van der Waals forces
What is the trend in atomic radius across Period 3?
decreases
Why does atomic radius decrease across Period 3?
-more protons added to nucleus
-more electrons added to outer main level
-increased charge pulls electrons closer to nucleus
-no shielding
What is the trend in first ionisation energy across Period 3?
increases
