Question

how can a periodic table help a chemist write the chemical name of a compound from its chemical formula?
by determining the number of atoms
by identifying the elements
by determining the prefixes
by determining the subscripts

Explanation:

The periodic table lists all known elements. When writing a chemical name from a formula, first, we need to know which elements are present. The periodic table helps identify these elements. For example, in the formula \(H_2O\), using the periodic table, we identify \(H\) (hydrogen) and \(O\) (oxygen). The number of atoms (subscripts like \(2\) in \(H_2O\)) and prefixes (used in naming covalent compounds based on subscripts) are related to the formula's structure but not directly obtained from the periodic table. The periodic table's main role here is element - identification.

Answer:

by identifying the elements