因?yàn)?/c>有43個(gè)質(zhì)子的元素還沒有被發(fā)現(xiàn)。
For decades physicists had been building up their theory of matter entirely in terms of electrons and protons.
幾十年以來，物理學(xué)家已經(jīng)以電子和質(zhì)子為基礎(chǔ)建立起他們的物質(zhì)理論。
When atoms were first proved to exist (and that was a mere century ago), they were thought to be made only of electrons and protons.
僅僅在一個(gè)世紀(jì)以前，人們首次發(fā)現(xiàn)微觀粒子時(shí)并認(rèn)為微觀粒子只由電子和質(zhì)子組成。
Atoms are held together by the electrical forces of attraction between each negative electron and a positive protons within the nucleus.
原子核中每一個(gè)負(fù)電荷電子和一個(gè)正電荷質(zhì)子之間的電的作用力的相互吸引，把原子結(jié)合在一起。
Officials said the collider would still take a planned monthlong break from colliding protons this fall.
有關(guān)官員表示，對撞機(jī)仍會按計(jì)劃于今年秋季展開為期一個(gè)月的質(zhì)子對撞實(shí)驗(yàn)。
The nucleus of an atom is composed of at least two types of particles---neutrons and protons.
原子核至少由兩種粒子組成―中子和質(zhì)子。
When protons collide at just under the speed of light, they're transformed into a spray of energy and new particles.
麗麗?阿斯奎斯博士是LHC音頻項(xiàng)目的發(fā)起人之一，她解釋說，當(dāng)質(zhì)子以光速碰撞后，就轉(zhuǎn)化成了一股能量和新的粒子。
The net charge of a body might be described by a statement of the excess number of electrons or protons in the body.
一個(gè)物體所帶凈電荷的量，可以用在這個(gè)物體內(nèi)的過剩電子數(shù)或過剩質(zhì)子數(shù)來表示。
Although all nuclei of a given element contain the same number of protons, they may have different numbers of neutrons.
雖然，給定元素的所有原子核都含有相同數(shù)目的質(zhì)子，但它們的中子數(shù)可以不同。
A rudimentary description of a nucleus consists in specifying the number of protons and neutrons it contains.
對某個(gè)原子核的初步描述，在于確定它所含的質(zhì)子和中子的數(shù)目。
The greater the number of protons, the greater is their tendency to blow the nucleus apart.
質(zhì)子數(shù)越大，它們使核爆裂的傾向也就愈大。
This conclusion is consistent with the idea that all atomic nuclear are built wholly of neutrons and protons.
這個(gè)結(jié)論與如下的思想是一致的：所有的原子核全部由中子和質(zhì)子組成。
Elements consist of atoms that consist of a nucleus of positive protons, neutral neutrons, and a shell of electrons.
組成元素的原子是由帶正電的質(zhì)子，中性的中子組成的原子核以及核外電子組成的。
Heavier nucleus was believed to be formed of a number of protons and electrons packed closely together.
人們相信，較重的原子核是由若干個(gè)質(zhì)子和電子緊密聚集在一起而形成的。
But theorists disagree on what might be the next magic number for protons.
但理論家們對于質(zhì)子下一個(gè)微妙的數(shù)是多少沒有達(dá)成共識。
atoms having an identical number of protons in each nucleus. Elements cannot be reduced to simpler substances by normal chemical means.
由原子組成的物質(zhì)，其原子中的每一核子具有同樣數(shù)量的中子、用一般的化學(xué)方法不能使之變得更為簡單的物質(zhì)的元素。
The old beam was created by smashing long bunches of protons into a target to produce neutrinos, which would then travel on to Gran Sasso.
過去的中微子束由長串質(zhì)子轟擊靶標(biāo)產(chǎn)生，之后發(fā)射到格朗薩索。
This weekend's test will mark CERN's first attempt to feed protons (or, simply, "beam" ) into the LHC from a chain of smaller accelerators.
本周末的測試標(biāo)志著CERN首次通過一系列小型加速器將質(zhì)子（或簡稱為“束”）導(dǎo)入LHC。
a mere century ago, when atom was proved to be exist, scientists thought that the atom was made of only electrons and protons.
當(dāng)一個(gè)世紀(jì)前，原子被證明存在時(shí)，人們認(rèn)為原子的結(jié)構(gòu)只有電子和質(zhì)子。
Although all nuclei of a given element contain the same number of protons, they may have different numbers of neutrons.
雖然，給定元素的所有原子核都含有相同數(shù)目的質(zhì)子，但它們的中子數(shù)可以不同。
Today, accelerators producing X-rays, protons, neutrons or heavy ions can be found at every major medical center in the U. S.
如今，全美每個(gè)主要醫(yī)療中心均具備產(chǎn)生X光、質(zhì)子、中子或重離子的加速器。
This calorimeter will measure the energy of particles that are produced close to the axis of the beam when two protons collide.
這種量熱計(jì)用來測量兩個(gè)質(zhì)子碰撞時(shí)光束軸附近產(chǎn)生的微粒的能量。
The core of the star gets compressed so much that the protons and electrons within it combine to become neutrons.
這時(shí)星體的核心會被壓縮得非常緊密以至于內(nèi)部的質(zhì)子和電子會結(jié)合在一起轉(zhuǎn)變為中子。
A rudimentary description of a nucleus consists in specifying the number of protons and neutrons it contains.
對某個(gè)原子核的初步描述，在于確定它所含的質(zhì)子和中子的數(shù)目。
So far, the Large Hadron Collider (LHC) has destroyed billions of protons by colliding them head-on inside its super-chilled detectors.
到目前為止，大型強(qiáng)子對撞機(jī)（LHC）已經(jīng)在它的超冷探測器內(nèi)通過正面碰撞的方式破壞了數(shù)十億個(gè)質(zhì)子。
As the universe expanded and cooled, some of these particles merged to form neutrons and protons.
在宇宙的擴(kuò)大與冷卻的過程中，這些粒子的一部分漸漸融合并組成了中子與質(zhì)子。
Most of it comes from the solar wind, a stream of protons moving at about 1. 6 million kilometers per hour in all directions from the sun.
太陽風(fēng)是來自太陽的質(zhì)子流，大約以每小時(shí)160萬公里的速度朝各個(gè)方向散發(fā)。
Quarks, which we also cannot see, are a model to explain the properties of the protons and neutrons in the nucleus of an atom.
我們也看不見夸克，它是解釋原子核中的質(zhì)子和中子性質(zhì)的一個(gè)模型。
Protons are positively charged whereas neutrons have no charge at all.
其中質(zhì)子帶正電荷，而中子是沒有電荷的。
There was less trumpeting this time, but protons were made to hit each other at energies higher than any accelerator had managed before.
這次就沒有那么熱鬧了，但是質(zhì)子之間相撞的能量比以前任何加速器都高。
Since the earliest days of particle accelerators, scientists and doctors have used healing beams of protons to kill cancer cells.
自有粒子加速器以來，科學(xué)家和醫(yī)生們就利用治愈質(zhì)子束來殺滅癌細(xì)胞。
A small, massive, positively charged structure at the centre of an atom composed of subatomic particles, namely the protons and neutrons.
原子核是在原子中央的一個(gè)細(xì)小結(jié)構(gòu)，高密度并帶正電荷，內(nèi)有質(zhì)子和中子。
英 [?pr??t?n] 
