Question

look at the model. then, choose the best answers.

1. choose the best answer.

which statement is true about this model?
the particles of the atom are fire, earth, water, and air.
the atom is not divided into any smaller or subatomic particles.
a positively charged core is surrounded by mostly empty space,
and negatively charged electrons orbit the core.
negative electrons float in a \soup\ of positively charged
material.

1. choose the best answer.

who proposed this model?
john dalton
earnest rutherford
j. j. thomson
aristotle

Explanation:

For question 8:

• The first option is incorrect as atoms are not composed of fire, earth, water, and air.
• The second option is wrong because atoms are made of sub - atomic particles (protons, neutrons, electrons).
• The third option is correct. In Rutherford's model, there is a positively charged nucleus (core) surrounded by mostly empty space with electrons orbiting the nucleus.
• The fourth option describes Thomson's plum - pudding model.

For question 9:

• John Dalton proposed the solid - sphere model of the atom.
• Earnest Rutherford proposed the nuclear model (the model in the picture).
• J.J. Thomson proposed the plum - pudding model.
• Aristotle had a different concept about matter (elements like earth, water, etc.) not related to this atomic model.

Answer:

1. A positively charged core is surrounded by mostly empty space, and negatively charged electrons orbit the core.
2. Earnest Rutherford