Question

On the periodic table, atoms of elements in the same period have the same what and and atoms on the same group have the same what

Answer 1

Answer: On the periodic table, atoms of elements in the same period have the same number of electron shells or energy levels, while atoms on the same group have the same number of valence electrons, which are the electrons in the outermost shell.

Explanation: On the periodic table, atoms of elements in the same period have the same number of electron shells or energy levels, while atoms on the same group have the same number of valence electrons, which are the electrons in the outermost shell.

Answer 2

On the periodic table, atoms of elements in the same period have the same number of electron shells, and atoms in the same group have the same number of valence electrons.

Step-by-step explanation:

On the periodic table, atoms of elements in the same period have the same number of electron shells. Atoms in the same group have the same number of valence electrons.

For example, in Period 3, all the elements have three electron shells. In Group 1, all the elements have one valence electron.

Therefore, the period and group of an element on the periodic table can provide information about the number of electron shells and valence electrons, respectively.