Write the chemical symbols for three different atoms or atomic cations with 4 electrons.

1) Be.

2) .

3) .

Explanation:

1) Be has  an atomic number of 4, thus it has  4 electrons.

2) has atomic number 5, the positive charge on boron indicates that it has lost one electron. Thus, it has also 4 electrons.

3)   has atomic number 6. After the loss of 2 electrons now, it has also 4 electrons.

chemical symbols are used to represent the elements. The main advantage of using these symbols is that we don't need to write complete name of that element. It is the one or two letter designation of the elements.