Elements in the same period (horizontal row) of the periodic table have the same number of atomic orbitals. In each period, the number of atomic orbitals increases by one as you move across the table from left to right.
For example, in the third period of the periodic table, the elements sodium (Na) and magnesium (Mg) have the same number of atomic orbitals. They are both in the third period and have a total of three atomic orbitals: one 3s orbital and two 3p orbitals. Similarly, elements such as carbon (C), nitrogen (N), and oxygen (O) in the second period all have the same number of atomic orbitals (one 2s orbital and three 2p orbitals).
In general, elements in the same period will have the same number of atomic orbitals.