Which statement best describes how electrons fill orbitals in the periodic table?
Electrons fill orbitals in order of their increasing energy from left to right.
Electrons fill orbitals in order of their increasing energy from right to left.
Elements fill orbitals in order of increasing energy from top to bottom in each gro
Elements fill orbitals in order of increasing energy from bottom to top in each gro

in the periodic table...

Each element's atomic mass and atomic number increases, as you can see on the periodic table, when you are going from left to right, then to the next                         period (horizontal line).

they emit helium gas that attaches to nearby planets.

they remove low-mass elements from the planets’ crust.

they cause nuclear fusion inside the inner core of planets.

they produce heavy elements such as iron and gold.

explanation:

i believe the answer is a.