What is the characteristics of the group 4A in the periodic table?

Answer 1

These elements are hard refractory metals. Titanium's mechanical properties make it useful in alloys. All isotopes of rutherfordium are radioactive, and have been synthesized in the laboratory, none of them have been found occurring in nature.

(Answer Improvement). There's a little confusion here - titanium and rutherfordium are elements of Group 4B of the Periodic Table, not 4A. Group 4A is often referred to as the Carbon Group and contains carbon (a non-metal), silicon and germanium (metaloids), and tin and lead (metals). Each of these elements contains 4 electrons in its outer shell (the p2 orbital). There is also a synthetic element referred to as ununquadium, which is short-lived and is created by shooting calcium-48 into plutonium-244. The element only lasts approximately 30 seconds before decaying into copernicium - which itself is also very short-lived. But the 4 electrons in the outer orbit is the common thread to all the elements in this group.