Answer:
A long time ago, people thought atoms looked like a mix of positive and negative charges, like a pudding with plums. But then, a scientist named Ernest Rutherford experimented with a tiny piece of gold. He discovered that atoms are not like pudding but have a small, dense center called a nucleus where positive things called protons live. Around the nucleus, little particles called electrons go in circles. This was a big change in how we understand atoms!
Step-by-step explanation: