THE ATOM

What is the name of the path an electron takes as it moves around the nucleus?

• line

• trajectory

• speed

• orbit

The mass of a proton is approximately (a)   times bigger than the mass of an electron.

A (a)   atom has the same number of protons and electrons.

Which particle moves around the nucleus?

• Neutron

• Electron

• Proton

When an atom loses electrons, it becomes an ion with ______charge

• positive

• negative

When an atom gains electrons, it becomes an ion with _______charge

• positive

• negative

The atoms with the same number of protons but different number of neutrons are called...

(a)  

Between electrons and protons there is a force of....

• attraction

• repulsion

Reorder the following events

• Democritus creates the word ATOMOS

• Bohr creates the pre-quantum atomic model

• Rutherford creates the planetary atomic model

• Schrödinger creates the cloud atomic model

• Thomson creates the plum pudding atomic model

Match the following:

• The cloud atomic model

• E. Rutherford

• The planetary atomic model

• J.J. Thomson

• The plum pudding atomic model

• Niels Bohr

• The word ATOMOS

• E. Schrödinger

• The prequantum atomic model

• Democritus