Comprehension Passage
The periodic table is a crucial tool in the field of chemistry. It organizes elements based on their atomic number, electron configuration, and recurring chemical properties. Elements are grouped in periods (horizontal rows) and groups (vertical columns). The elements in the same group have similar chemical properties due to the same number of valence electrons. For example, Group 1 elements, known as alkali metals, are highly reactive.
What determines the position of an element in the periodic table?
1
Its density and state at room temperature.
2
Its atomic number and electron configuration.
3
Its melting and boiling point.
4
Its reactivity with water.