Structure of an atom

Question 1

how has the Dalton model of an atom has changed over time

Answer 1

discovery of subatomic particle such as electron, proton, neutron, proves that it is divisible,

Question 2

Describe the structure of an atom as a nucleus containing protons and neutrons, surrounded by electrons in shells

Answer 2

The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).

Question 3

Why is the nucleus small?

Answer 3

The nucleus contains the majority of an atom’s mass