Question

1. which element forms a compound with chlorine with the general formula mcl?

(1) rb
(2) ra
(3) re
(4) rn

Explanation:

• Chlorine has a charge of - 1 (\(Cl^-\)).
• For the compound \(MCl\), the metal \(M\) must have a charge of + 1.
• Rubidium (\(Rb\)) is in Group 1 of the periodic table and forms \(Rb^+\) ions.
• Radium (\(Ra\)) is in Group 2 and forms \(Ra^{2 +}\) ions (would form \(RaCl_2\)).
• Rhenium (\(Re\)) can have various positive charges (e.g., + 2, + 3, etc., but not typically + 1 in a simple chloride like \(MCl\)).
• Radon (\(Rn\)) is a noble gas and is generally unreactive and does not form simple ionic compounds like \(MCl\).

Answer:

(1) \(Rb\)