举一反三
- Which of the following is not a valid conclusion from Rutherford’s alpha particle scattering experiment? ( ) A: The nucleus must be positively charged B: The nucleus must be very small compared to the atom C: The atom is mainly empty space D: The mass of the atom is mostly concentrated in the nucleus
- The<br/>main morphological characteristics of serous nuclei are as follows() A: The<br/>nucleus is round, at the bottom of the cell base. B: The<br/>nucleus is oblate, at the bottom of the cell base. C: The<br/>nucleus is round, at the center of the cell. D: The<br/>nucleus is oblate, at the center of the cell. E: The<br/>nucleus is at the top of the cell.
- Around the nucleus of a hydrogen atom moves a single electron._
- Nuclear power plants use the forces within the nucleus of an atom to generate electricity. ()generate A: produce B: liquidate C: change D: retard
- The nucleus(原子核) has a diameter(直径) only 0.01% of that of the atom itself.
内容
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Which nucleus gives off parasympathetic preganglionic fibers to enter facial nerve in brainstem? A: inferior salivatory nucleus B: nucleus ambiguus C: superior salivatory nucleus D: dorsal nucleus of vagus nerve
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Which nucleus gives off parasympathetic preganglionic fibers to enter facial nerve in brainstem?() A: inferior salivatory nucleus B: nucleus ambiguus C: superior salivatory nucleus D: dorsal nucleus of vagus nerve E: accessory nucleus of oculomotor nerve
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Which<br/>nucleus gives off parasympathetic preganglionic fibers to enter<br/>facial nerve in brainstem?() A: inferior<br/>salivatory nucleus B: nucleus<br/>ambiguus C: superior<br/>salivatory nucleus D: dorsal<br/>nucleus of vagus nerve E: accessory<br/>nucleus of oculomotor nerve
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Rutherford proposed ( ) by analyzing the results of the α particle scattering experiment A: Atomic nuclear structure model B: There are neutrons in the nucleus C: Electrons are part of atoms D: The nucleus is made up of protons and neutrons
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It was these experiments that first showed the atom to consist of a small, massive nucleus(重实的原子核), surrounded by electrons.