HA revision: atoms

Which was NOT part of Dalton's theory?

• All atoms of the same element are identical.

• Atoms of elements join together in simple ratios.

• Atoms contain negatively charged electrons.

• Atoms cannot be created or destroyed.

Which of these WAS a part of Dalton's atomic theory?

• Atoms are always moving around.

• The shapes of individual atoms reflect the properties of the subtance they form.

• Atoms are indivisible: they are fundamental and cannot be split into any smaller parts.

• Atoms contain a small, dense nucleus.

Which of the 3 subatomic particles was discovered by Thompson?

• Proton

• Electron

• Neutron

What did Rutherford's Gold Foil Experiment (1911) reveal about atoms?

• All atoms are mostly empty space.

• All atoms contain protons.

• All atoms contain neutrons.

• Atoms are neutrally charged.

What did Rutherford's Gold Foil Experiment (1911) reveal about atoms?

• Atoms are neutrally charged.

• Atoms contain a tiny, positively charged nucleus.

• Atoms' electrons are organised into energy levels / "shells".

• Atoms contain a tiny, neutrally charged nucleus.

Why is the nucleus positive?

• Because it attracts electrons.

• Because it contains electrons.

• Because it attracts protons.

• Because it contains protons.

Atomic number (on the Periodic Table) is always equal to...

• the number of electrons.

• the number of protons.

• the number of neutrons.

Atomic number (on the periodic table) is also, for neutral atoms, equal to...

• the number of electrons.

• the number of neutrons.

Atomic number (on the Periodic Table) is also, for neutral atoms, equal to...

• the number of electrons.

• the number of neutrons.

"Neutral" atoms, means they have...

• a nucleus.

• no nucleus.

• a charge.

• no charge.