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Group 4 refers to the vertical column in the periodic table containing elements like carbon, silicon, germanium, tin, and lead, all of which have four electrons in their outer shell. These elements are important because their four-electron structure makes them useful in many applications, from the silicon used in computer chips to the carbon found in all living things.
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group 3 ← → group 5
Group 4 is the second group of transition metals in the periodic table. It contains only the four elements titanium (Ti), zirconium (Zr), hafnium (Hf), and rutherfordium (Rf). The group is also called the titanium group or titanium family after its lightest member.