The Periodic Table

Question 1

metals

Answer 1

• left of the periodic table
• +1 ions
• high melting and boiling points
• ductile
• malleable

Question 2

non-metals

Answer 2

• left of the periodic table
• negative ions
• insulators
• low melting and boiling points

Question 3

arrangement of elements

Answer 3

• order of atomic number
• elements in the same group have the same number of outer electrons
• elements in the same row have the same number of shells

Question 4

Mendeleev’s arrangement

Answer 4

• left gaps for undiscovered elements
• elements were later discovered and the gaps were filled
• knowledge of isotopes explained why ordering based on atomic number was not always correct