1. Current atomic model
We don´t talk about orbits, we talk about orbitals: regions of space where the probability of finding an electron is very high.
Each orbital is defined by a number (1, 2, 3, 4, 5...), which indicates the layer, and a letter (s, p, d or f), which indicates the shape of the orbital.

3. In each orbital there are 2 electrons at most.
In each layer there can be one s orbital, three p orbitals, 5 d orbitals and 7 f orbitals.
Therefore, there are (at most) 2 electrons in s orbitals, 6 electrons in p orbitals, 10 electrons in d orbitals and 14 electrons in f orbitals.
For example, the atomic number of C is 6 (Z=6), so it has 6 protons.
When C is in neutral state it has 6 electrons, and its electron configuration is:
1s2 2s2 2p2

4. To make the electron configuration of each element you have to follow Moeller´s diagram:

5. Write the electron configuration of the following atoms:Li Na Mg Ca Co Zn O S