An atom with an atomic number of 103 would have 103 protons.
The element with atomic number 103 is known as Lawrencium. It is a synthetic element that was first synthesized in 1961 by a team of scientists led by Albert Ghiorso at the Lawrence Berkeley National Laboratory in California, United States. Lawrencium is named after Ernest O. Lawrence, the inventor of the cyclotron, which played a crucial role in the discovery of many transuranium elements. Due to its high atomic number, Lawrencium is highly unstable and has a very short half-life, making it challenging to study and characterize.