Question

1. choose all that apply.

which three element pairs are likely to react with each other?
rb and ca
li and be
f and ne
rb and br
fr and cl
li and cl

Explanation:

• Rb and Br: Rubidium (Rb) is a highly reactive alkali metal (loses one electron easily as it has one valence electron). Bromine (Br) is a halogen (gains one electron as it has seven valence electrons). They react to form ionic compounds (\(RbBr\)).
• Fr and Cl: Francium (Fr) is an alkali metal (loses one electron). Chlorine (Cl) is a halogen (gains one electron). They react to form ionic compounds (\(FrCl\)).
• Li and Cl: Lithium (Li) is an alkali metal (loses one electron). Chlorine (Cl) is a halogen (gains one electron). They react to form ionic compounds (\(LiCl\)).

• Rb and Ca: Both are metals. Metals tend to lose electrons, and there is no complementary electron - transfer pattern (one losing and one gaining in a simple way) for a reaction like an ionic compound formation.
• Li and Be: Both are metals. Similar to the Rb - Ca case, there is no straightforward electron - transfer for a reaction.
• F and Ne: Fluorine (F) is a halogen (wants to gain an electron). Neon (Ne) is a noble gas with a full valence shell. Noble gases are very stable and do not easily react with other elements.

Answer:

Rb and Br, Fr and Cl, Li and Cl.