Periodic Table

Question 1

Atomic number

Answer 1

The atomic number shows the number of protons & electrons in that element
- The smaller number

Question 2

Mass number/Relative Atomic Mass

Answer 2

Mass number is the SUM of PROTONS + NEUTRONS
- The bigger number

Question 3

Groups

Answer 3

Groups are the VERTICAL COLUMNS
- Group number tells us the number of electrons in the valence shell

Question 4

Periods

Answer 4

Periods are the HORIZONTAL ROWS
- Period number tells us the number of electron shells in that element

Question 5

Electron shells

Answer 5

• 1st shell holds a maximum of 2 electrons
• 2nd shell holds a maximum of 8 electrons
• 3rd shell holds a maximum of 8 electrons