Question

which of the following is a true statement? * 2 points rows/periods on the periodic table are used to identify the number of valence electrons in atoms. bohr models are used to represent valence electrons. it is easy to determine the valence electrons for transition metals by looking at the group numbers on the periodic table. groups/columns on the periodic table are used to identify the number of valence electrons in main group elements.

Explanation:

Rows/periods indicate energy levels, not valence - electron number. Bohr models show all electrons, not just valence. Transition - metal valence - electron determination is complex and not straightforward from group numbers. For main - group elements, group/column number often equals the number of valence electrons.

Answer:

Groups/columns on the Periodic Table are used to identify the number of valence electrons in main group elements.