PERIODIC TABLE OF ELEMENTS

1234567
Across
  1. 3. What is the element that is a colourless, odourless, tasteless gas that is the most plentiful element in Earth's atmosphere and is a constituent of all living matter?
  2. 5. What element has a mass of 114.82
  3. 6. What makes up 75% of the Periodic Table?
  4. 7. What is the most reactive non-metal on the periodic table?
Down
  1. 1. What is the hardest element on the periodic table?
  2. 2. What is the softest element on the periodic table?
  3. 4. What element has 22 protons?