What is the origin of the word 'atom'?

• German, meaning 'unit'

• French, meaning 'particle'

• Greek, meaning 'indivisible'

• Latin, meaning 'smallest'

Who discovered that atoms are made of subatomic particles?

• Albert Einstein

• Niels Bohr

• Sir William Crookes

• Isaac Newton

What is the central part of an atom called?

• Neutron core

• Proton center

• Nucleus

• Electron cloud

What did Joseph John Thomson initially call electrons?

• Atoms

• Neutrons

• Protons

• Corpuscles

How much lighter are electrons compared to hydrogen atoms?

• 1,000 times

• 100,000 times

• 100 times

• 10,000 times

Who was the first to discover the existence of protons?

• James Chadwick

• Ernest Rutherford

• Eugene Goldstein

• Joseph John Thomson

What is the relative charge of a proton?

• Negative one

• Positive two

• Zero

• Positive one

Who discovered neutrons?

• Albert Einstein

• James Chadwick

• Marie Curie

• Niels Bohr

What is the charge of a neutron?

• Variable

• Negative

• Positive

• Neutral

Why do atoms have different properties?

• Different numbers of subatomic particles

• Different shapes

• Different sizes

• Different colors