Question

An element has an atmomic number of 68. The number of protons and electron in a neutral atom of the element are?

Answer 1

Step-by-step explanation:

An element whose atomic number is 68 (number Z), has 68 electrons and 68 protons. According to the periodic table it corresponds to the element Erbium (Er), whose mass number (A) is 167. The number of neutrons is 167-68 = 99.