Which information about an atom can a period number give you?
1) how many bonds it will make
2) how many energy levels it has
3) the ionic charge it forms
4) the number of valence electrons it has
2) how many energy levels it has
4) the number of valence electrons it has
The correct answer is 2) how many energy levels it has.
The period number in the periodic table indicates the number of occupied energy levels an atom has. Each period represents a different energy level in an atom. For example, atoms in the first period have only one energy level, while atoms in the second period have two energy levels, and so on.
The other options are not directly determined by the period number. The number of bonds an atom can form depends on its valence electrons, not the period number. The ionic charge an atom forms is determined by the gain or loss of electrons to achieve a stable electron configuration, which is not directly related to the period number. Lastly, the number of valence electrons is determined by the group number or column on the periodic table, not the period number.