Question

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 right to left.
elements fill orbitals in order of increasing energy from bottom to top in each group.

Explanation:

在元素周期表中，电子按照能量从低到高的顺序填充轨道，从左到右能量逐渐增加。

Answer:

Electrons fill orbitals in order of their increasing energy from left to right.