The correct answer is Pb and Sn. Key Points - Soldering is the process of joining two metal objects together by a third soft metal alloy which is called solder. - Solder is a metal alloy that melts at a lower temperature than the metals being soldered. - Two types of solder are commonly used. - One is a soft solder, which is an alloy of tin(Sn) and lead(Pb). - The other is a hard solder, which is an alloy of copper and zinc also called spelt or silver solder. - Element Tin (Sn) belongs to Group 14 of the periodic table. - Atomic Number - 50 - Atomic Mass - 118.710amu. - Element Lead (Pb) belongs to Group 14 . - Atomic Number - 82 - Atomic Mass - 207.2 amu.
