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Elements across a series have the same number of atomic energy levels. An elemental series is better known as a period.
True.
The elements of the periodic table are arranged in groups and periods. All of the elements in a period have the same number of atomic orbitals where as in a group all the elements have the same number of valence electrons.
Sodium and calcium each have the same number of orbitals. These two elements (in their neutral, ground state) have 6 electron orbitals: 1s, 2s, 2px, 2py, 2pz, 3s.
Magnesium
No two different elements can have the same atomic number.
They are in the same column.
hybridization
No two elements may have the same atomic number. But two elements may have same atomic mass. Hence atomic number is better than atomic mass.
all elements in a period have the same amount of orbitals and if an element is in period 2 it has 2 orbitals if it is in period 3 it has 3 orbitals ..etc
No.
Elements have the same number of protons in each atomic nucleus.