I think you forgot to give the choices along with your question. I am answering the question based on my research and knowledge. "Helium effuses 0.71 times faster than hydrogen" is the statement that <span>holds true when the molar mass of hydrogen is 2.0 grams and that of helium is 4.0 grams. I hope the answer has helped you.</span>
<span>A molecule consists of two or more atoms that are chemically bonded. together. Atoms ... In a nuclear change new materials are formed by changes ... In one isotope called Deuterion the nucleus contains a proton and a neutron. ... It has 3 protons and 4 neutrons in its nucleus and 3 electrons. Two of .... Yttrium 39 2 8 18 9 2.</span><span>
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Answer:
The plum-pudding model did not identify a central nucleus as the source of a positive charge.
Explanation:
Sir Joseph John Thomson, most popularly known as J J Thomson. He was a famous scientist who was awarded the Noble prize for Physics for his discovery of the subatomic particle, electron.
He placed his famous model of an atom which is known as plum pudding model. He proposed that the atoms are described as the negative particles that is floating within a soup of the diffuse positive charge.
But the main defect of his proposal was that it did not recognized the presence of a central nucleus as a positive charged source.
Answer:
i have been doing research and i think its the style. if not its the pollen tube.
Explanation:
Hope i helped!