Electron arrangementIB MYP Chemistry: Mind map

Exam questions on Electron arrangement

1. A teacher tells her class that a neutral sulfur atom has 16 electrons. She asks the students to work out how those electrons are arranged in shells, and what the arrangement shows about where sulfur sits in the periodic table.
   Explain how the electron arrangement of sulfur shows its group and period in the periodic table.2 marks
2. A chemist compares three elements with different reactivity. Argon has atomic number 18 and is very unreactive. Sodium has atomic number 11 and potassium has atomic number 19, and both are very reactive metals that must be stored under oil.
   Explain why sodium and potassium have similar chemical properties.2 marks
3. Calcium has atomic number 20 and is a metal in the same group of the periodic table as magnesium, which has atomic number 12. A student is using electron arrangements to compare the two metals.
   State the electron arrangement of calcium and use it to give the group and period of calcium.3 marks