Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number.
Check
Across: 3. The isotopes which are unstable, as a result of the extra neutrons in their nuclei are radioactive and are called 4. the numbers which designate and distinguish various atomic orbitals and electrons present in an atom are called ............. 5. A stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
Down: 1. Atoms of different elements with diff erent atomic numbers, which have the same mass number, are known as............ 2. Atoms of different elements with different atomic numbers and different mass numbers, but with same number of neutrons are called ...........