1.
To find out number of neutrons in an atom, we need to know the

2.
The attraction of two ions due to opposite charge is known as

3.
To trace the path of phosphorus, the isotope of phosphorus which is added to the fertilizers, is

4.
If the mass of protons and neutrons is 1, then the mass of electron is

5.
The name of physicist who discovered the nucleus of atom was

6.
Sodium ion has

7.
Radioactive particles give off

8.
The formula that shows the number and kind of atoms which a substance of a molecule contained, is known as

9.
Sodium becomes a cation when

10.
The symbol of potassium is

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