Group 4 is a group of elements in the periodic table. It contains the elements titanium (Ti), zirconium (Zr), hafnium (Hf) and rutherfordium (Rf). This group lies in the d-block of the periodic table. The group itself has not acquired a trivial name; it belongs to the broader grouping of the transition metals. The three Group 4 elements that occur naturally are titanium (Ti) , zirconium (Zr) and hafnium (Hf) .
The battle broke out at Concord. Seventy-three British soldiers were killed and over 200 were wounded. The Americans lost 49 soldiers and suffered 39 wounded. Late on the night of April 18th, 1775 British troops departed Boston for Concord and Lexington in pursuit of Colonial arms.
ride,â spreading the news. In Lexington, they were joined by Dr. Samuel Prescott. When Revere and Dawes were stopped by a British patrol, Prescott broke away and carried the message to Concord. Lexington and Concord At dawn on April 19, some 700 British troops reached Lexington.They found Captain John Parker and about 70 militiamen waiting. The British commander ordered the Americans to drop their muskets. They refused. No one knows who fired first,but within a few minutes eight mili-tiamen lay dead. The British then marched to Concord,