Across
- 1. Scientists have arranged the elements in a table called_______ table.
- 6. A neutral particle of an atom found in its nucleus is called ______________.
- 7. Group 17 elements are called______ family.
- 8. Atoms of same elements have different mass number are its_______.
Down
- 2. Elements in periodic table are arranged on the basis of their properties and arrangements of ____________ around the nucleus.
- 3. Group 3 to 12 elements are called ___________family.
- 4. A negatively charged particle of an atom found around its nucleus is called____________.
- 5. The number of electrons present in an atom is equal to the number of _________________