Question

do you expect the pair of elements li and na to be most similar?
1 the words in the left column to the appropriate blanks in the sentences on the right.

li and na are elements of the same , therefore, they have the same number of , which determine similar properties.

Explanation:

• Group: Elements in the same group (vertical column) of the periodic table share similar chemical properties. Lithium (Li) and Sodium (Na) are both in Group 1 (alkali metals).
• Valence electrons: Valence electrons are the electrons in the outermost shell of an atom. Elements in the same group have the same number of valence electrons. For Group 1 elements like Li and Na, the number of valence electrons is 1.
• Chemical properties: The number of valence electrons largely determines an element's chemical behavior, such as its reactivity and the types of bonds it forms. Since Li and Na have the same number of valence electrons (due to being in the same group), they have similar chemical properties.

Answer:

Li and Na are elements of the same group, therefore, they have the same number of valence electrons, which determine similar chemical properties.