The model of the atom has changed over time due to the discovery of the different subatomic particles.
Which subatomic particles led to J.J. Thomson's plum pudding model?
☐ | A | protons | |
☐ | B | neutrons | |
☐ | C | electrons | |
☐ | D | nucleus |
The diagram shows the structure of an atom using the current model of the atom.
How does this diagram show that this is an atom of lithium?
☐ | A | it has three electrons | |
☐ | B | it has three protons | |
☐ | C | it has three protons and two neutrons | |
☐ | D | it has two neutrons |
Complete the sentence about atoms.
The size of the nucleus is very ................................ in comparison with the overall size of an atom.
Which of these statements is correct about atoms?
☐ | A | electrons are positively charged | |
☐ | B | the number of protons is equal to the number of neutrons | |
☐ | C | most of the mass of an atom is concentrated in the nucleus | |
☐ | D | electrons are found in the nucleus |
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