The first major city in the western hemisphere was located in which country?

Mexico City in Mexico

Explanation: Mexico City is a city located in current day Mexico. The city has been inhabited from as early as 100AD.

The Toltecas were among the earliest inhabitants of Mexico City, among its early inhabitants were the popular Aztech tribe with their early forms of Technology.

because the two particles have an equal charge, the charges will cancel out and give the atom an overall charge of 0. so, if at atom has 35 protons in the nucleus, we could expect it to have 35 electrons orbiting that nucleus.