C1 Flashcards
Which number on the periodic table is the mass number
The top one
Which number on the periodic table is the atomic number
The bottom one
How do you calculate number of neutrons
Mass number- atomic number
What does the atomic number show
Number of protons and electrons
Why were there gaps in mendeleevs periodic table
For undiscovered elements
Why did early scientists use atomic mass and not atomic number
Neutrons and protons hadn’t been discovered yet
How did discovery of isotopes explain why atomic weights do not always give the correct order of elements
Some elements have different numbers of neutrons but same chemical properties
How are elements ordered in the periodic table
Atomic number
Where can metals and non metals be found in the periodic table
Metals: towards left and bottom
Non metals: towards right and top
