Exercise Group-A
1. What are metals? Give any two examples.
2. What are non-metals? Give any two examples.
3. What are metalloids? Write any two examples.
4. Write any two physical properties of metals.
5. Write down the atomic number, atomic weight and valency of
i) Lithium ii) Magnesium iii) Potassium iv) Iron v) Zinc
6. Name the metal which is found in liquid state at normal temp
7. Name
Name any two soft metals.

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.