Question

1. There are some vacant places in the Mendeleev's periodic table.
In some of these places the atomic masses are seen to be
predicted. Enlist three of these predicted atomic masses along
with their group and period.​

Answer 1

Answer:

The three elements were :

- Gallium :

• group : 13
• period : 4

- Germanium :

• group : 14
• period : 4

- Scandium :

• group : 3
• period : 4

that's it! hope it helps buddy! let me know if there's anything wrong or missing : )