Welcome to the Quiz!

This quiz contains 6 questions from a mix of 1 subtopics.

When Democritus first conceived of atomic theory, around 500 BC, how did he describe atoms?

(Select all that apply)

The smallest possible unit of matter 

Separated from each other by empty space

Small spheres

Tiny living creatures

0

/

3

rocks / cubes / spheres / atoms / elements 


In the 1800's, John Dalton described atoms as solid , and suggested that different types of spheres make up the different

spheres
elements

0

/

2

In 1897 J. J. Thomson theorised that an atom consisted of a ball of positive charge, with negative electrons mixed throughout it. What do we call this model? 

Plum pudding model

Quantum Model

Atomic model

Nuclear model

0

/

1

How Rutherford developed the nuclear model


beta / deflected / positive / alpha / negative


  1. In Rutherford's experiments, particles were fired at a thin sheet of gold foil.
  2. Most particles passed through, but some were off course. 
  3. This caused him to hypothesise that there was a dense region of charge at the centre of the atom that repelled the alpha particles.
  4. As a result he developed the nuclear model of the atom, in which there was a central positive nucleus, surround by electrons. 
alpha
deflected
positive
negative

0

/

4

One issue with Rutherford's nuclear model was that the atom should collapse as the negative electrons would be attracted to the positive nucleus, causing them to rush inwards.


In response to this, in 1913 Bohr suggested that electrons ___________________, which prevents the atom from collapsing. 

are actually positively charged 

have magnetic repulsion

orbit the nucleus in shells

0

/

1

Diagram showing an atomic nucleus with electrons in orbit.

In the 20th century, Chadwick discovered neutral particles in the atomic nucleus. What are these particles called?

Electrons

Protons

Neutrons

0

/

1