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The nucleus of a hydrogen atom has contained over 99.9% of the mass

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The nucleus of a hydrogen atom has contained over 99.9% of the mass  [#permalink]

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New post 22 Aug 2018, 18:05
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A
B
C
D
E

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The nucleus of a hydrogen atom has contained over 99.9% of the mass of the atom, but only has occupied 1/10,000 of the atom's volume.

A. has contained over 99.9% of the mass of the atom, but only has occupied
B. containing over 99.9% of the mass of the atom, but only occupies
C. contains over 99.9% of the mass of the atom, but only occupies
D. has contained over 99.9% of the mass of the atom, but occupying only
E. contains over 99.9% of the mass of the atom, but occupies only

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Re: The nucleus of a hydrogen atom has contained over 99.9% of the mass  [#permalink]

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New post 22 Aug 2018, 18:23
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aragonn wrote:
The nucleus of a hydrogen atom has contained over 99.9% of the mass of the atom, but only has occupied 1/10,000 of the atom's volume.

A. has contained over 99.9% of the mass of the atom, but only has occupied
B. containing over 99.9% of the mass of the atom, but only occupies
C. contains over 99.9% of the mass of the atom, but only occupies
D. has contained over 99.9% of the mass of the atom, but occupying only
E. contains over 99.9% of the mass of the atom, but occupies only



Errors..
1) Tense :- the sentence talks of a fact so requires 'simple present' and not 'present perfect'. Therefore HAS is wrong at both places.
2) placement of ONLY - ONLY should be used next to item that is to be limited. Here it is 1/10000 of the atoms volume, so should be just ahead of it ... Only 1/10000...

E corrects both errors
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Re: The nucleus of a hydrogen atom has contained over 99.9% of the mass  [#permalink]

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New post 11 Jul 2019, 21:07
The nucleus of a hydrogen atom has contained over 99.9% of the mass of the atom, but only has occupied 1/10,000 of the atom's volume.

The sentence states a general fact about the hydrogen atom.

A and D are incorrect because they use present perfect "has contained" to denote a general fact about the nucleus. Using the present perfect (has/have + PP) denotes something that started in the past and continues to now, but we aren't talking about an event. Also the "only" is incorrectly placing emphasis on the occupation instead of the insignificant amount of volume occupied.
B takes away the verb from the first clause, making it a fragment. Incorrect

C. contains over 99.9% of the mass of the atom, but only occupies
E. contains over 99.9% of the mass of the atom, but occupies only

Between C and E the only difference is the placement of only.
In literal meaning, C communicates that Object x ONLY occupies [here] (and not [there]) - thus emphasising the locality of occupation.

In literal meaning, E communicates that Object X occupies ONLY x/100 of [HERE] - thus emphasising the degree of occupation of Object X.

We state one key fact about the nucleus and then emphasise this fact be stating the degree to which the nucleus occupies the volume. Thus E is correct.
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Re: The nucleus of a hydrogen atom has contained over 99.9% of the mass   [#permalink] 11 Jul 2019, 21:07
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The nucleus of a hydrogen atom has contained over 99.9% of the mass

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