What is the atomic number of an element?ps:Please answered i

how to coculate the atomic mass of an element
如何计算原子质量

There are two major problems linked with atomic power plants,the first ___ concerns nuclear waste.
A.of both
B.of whom
C.of which
D.of the two
请问选哪个?选和不选的原因?顺便把句子翻译成中文.

for which这里的 怎么理解 There have been atomic number,for which there is no known element.

The first use of atomic weapons was in 1945,and their power __ increased enormously ever since
这里为什么用has been 而不是用had been

there are plans ( ) a number of atomic power station in this regions

1.There are plans___a number of atomic power station in this regions.
a.to build
b.to be built
c.building
d.being built
2.All of us are looking forward to ____a trip to the Ming Tombs.
a.make
b.making
c.to making
d.have made
3.I can't understand____a decision until it is too late.
a.him to postpone to make
b.his postponing to make
c.him to postponing making
d.his postponing making
4.I would like___that i don't have a very high opinion of you.
a.to have you know
b.have you know
c.to have your know
d.having you know
5.I had intended____him while he was living at Aberdeen.
a.visiting
b.to visit
c.to have visited
d.having visited
6.The famous scientist was easy____along with.
a.to get
b.for getting
c.getting
d.got
7.The students will have more discussions like this in the weeks___.
a.coming
b.to come
c.come
d.to be coming
8.He felt lonely at first,but after a time he got___alone and even got ____it.
a.used to living...to like
b.used to live...to like
c.using to live...liking
d.to be used to living...liking
9.Our master raised his voice so that he could make himself___by the pupils in the back of the hall.
a.hear
b.heard
c.hearing
d.to be heard
10When he awoke,he found himself____in the hospital and____by an old woman.
a.lying...being looked after
b.lying...be looking after
c.lie...be looked after
d.lie...being looked after

Would you have authorized the use of the atomic bomb to end the war?

The atomic structure is ,as it were ,a miniature solar system.
为什么填as it were呢?

100分求一道物理题,
If aluminum (Al),with an atomic weight of 27,combines with oxygen (O),with an atomic weight 16,to form the compound aluminum oxide (Al2O3),how much oxygen would be required to react completely with 52g of aluminum

英语翻译
(1) On July 16th,1945,the world's frist atomica,Atomic bombs are terrible and dangerous.They are bad for the peace.We must do something to protect our world,and be against the war of atomic bombs.
(2)There are more and more people born every year and there are a lot of problems,too.
就是这两段,请尽快翻译下,

16.Like the visible spectrum,an atomic emission spectrum is a continuous
range of colors.
17.Each element has a unique atomic emission spectrum.
18.A flame test can be used to identify the presence of certain elements in
a compound.
19.The fact that only certain colors appear in an element’s atomic emission
spectrum indicates that only certain frequencies of light are emitted.
20.Atomic emission spectra can be explained by the wave model of light.
21.The neon atoms in a neon sign emit their characteristic color of light as
they absorb energy.
22.When an atom emits light,photons having certain specific energies are
being emitted.
判断正误

英语翻译
The atomic structure is ,----------- a miniature solar system
A as it were B as if they were C as if are

翻译这句话哇,最好懂化学的进.
If 2 atoms with the same atomic number are attached to a given carbon atom,then the next bonded atom is taken into account.

【计算机英语】The fact that I think the method is atomic signals that ...
The fact that I think the method is atomic signals that we should use a Service [Evans DDD] instead to make the whole thing more explicit.The Service could check the current debt and therefore be used proactively by the Order at good places in time.It could also be used pretty much reactively at save time,and some sort of request could be put on a queue and be used reactively after save.The Service would probably use the same Repository method as was just discussed,but that's not anything the caller needs to know,of course.
What should it do reactively after the save?Perhaps move the order to one of two states so that when the user stores an order,it goes into state NewOrder.Then the Service kicks in and moves the order to state Accepted or Denied
我实在看不懂了

In an atomic physics experiment, two atoms collide with each other in such a way that the initial total momentum of the atoms is zero. The atoms are chosen so that M2 = 3.5 M­1.
In the collision, the atom M1 has a final velocity, V1f = - 0.40 V1i. What is the ratio of the final kinetic energy to the initial kinetic energy of the system (the two atoms)? In other words, what is
KEfinal / KEinitial
in this collision?

1,a different in the (mass,atomic )number of atoms means the atoms are of different element.
2table salt is an example of a (compound ,mixture )
3isotopes enable scientists to determine the (size ,age)of some rocks and fossils.
---------
4matter with atoms in a fixed position in relation to one another is in ( ) state.
5 an object's density is equal to its mass divided by its ( )

The first use of atomic weapons was in 1945,and their power_____increased enormously ever since.
A is
B was
C has been
D had been
选什么,

翻译：A neutron is a nuclear particle with an atomic mass of 2.0 and a neutral electrical charge.

the first man to base a theory of atomic constitution of matter on proved facts was Dalton
请问这句话的意思,
base a theory

The atomic mass of copper is 63.55 amu.There are only
two isotopes of copper,63Cu with a mass of 62.93 amu and
65Cu with a mass of 64.93 amu.What is the percentage
abundance of each of these two isotopes?

In future when solar energy and atomic energy come into wide use,our ____ upon fossil fuels (矿物燃料) will not be as great as it is today.
选项:
a、tension
b、pressure
c、independence
d、dependence
______,he could not lift the weight.
选项:
a、Strong while he was
b、 However strong as he was
c、 Strong as he was
d、 Strong although he was
American women usually identify their best friend as someone ______ they can talk frequently.
选项:
a、who
b、 as
c、 about which
d、 with whom
The ______ of new scientific discoveries to industrial production methods usually makes jobs easier to do.
选项:
a、development
b、 application
c、 expression
d、 explanation
All the employees except the manager ______ to work online at home.
选项:
a、encourages
b、 encourage
c、 is encouraged
d、 are encouraged
As more and more factories become ____ dependent on oil,the oil-producing countries are more powerful than ever before.
选项:
a、normally
b、basically
c、increasingly
d、consequently
His few personal belongings made it possible for him to move from place to place ____.
选项:
a、at ease
b、on time
c、with ease
d、in time
It would be unwise to ______ too much importance to what he sai；
选项:
a、pay
b、 provide
c、 attach
d、 indicate
Felix is ______ a bunch of red roses by a young girl as he came out of his car in front of a large house outside London.
选项:
a、presented
b、 offered
c、 volunteered
d、 suppliedBenjamin O.Davis Jr.was ______ an assistant secretary of the Department of Transportation in 1971.
选项:
a、appointed
b、 employed
c、 designed
d、 discharged
People around the world are becoming more and more ____ about the population explosion.
选项:
a、concerned
b、interested
c、involved
d、worrying
John tried to ____ me that he was capable of looking after the five children and asked me to leave them to him when I was away.
选项:
a、sure
b、ensure
c、insure
d、assure
That’s an unpleasant thing to say about your father after ______ he’s done for you.
选项:
a、something
b、 anything
c、 all
d、 that
Much importance should be ____ to the conservation of the endangered animals.
选项:
a、attached
b、acquired
c、afforded
d、awarded

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As soon as Would II ended,Einstein urged that atomic energy( D )put to peaceful uses.
A is B would be C was to D be
为什么选D?以及B为什么不对?urged that ..不是宾语从句吗,为什么用动词原形be啊.

几道英语化学题!
1.how are the atomic numbers and the atomic masses of the elements related to how the elements are arranged on the periodic table?
2.how does the number of electrons relate to the arrangement what is the different in the number of electrons in a 3rd period element and the 2nd period element above it?
3.do some elements next to each other have the same number of neutrons?how is that possible?
4.how are the colors arranged,and what coclusions can be drawn from this arrangement?
thank!

sat化学题
Isotopes(同位素) of uranium have different
a.atomic numbers
b.atomic masses
c. d.
想问下a为什么不对?答案是b

化学元素里面的mass
请问一下,在化学元素里面,
mass 是不是指relative atomic mass?
(注意这个mass真的是mass,不是mass number)

高中英语选择疑难
1、James Scott will ______ as chairman of Atomic Energy Commission when Harrison retires.
A、take off B、take back C、take up D、take over
2、The bird was lucky that it just missed ______.
A、catching B、to be caught C、being caught D、to catch
3、I can hardly imagine Peter _______ across the Atlantic Ocean in five days.
A、sail B、to sail C、sailing D、to have sailed
4、The news reporters hurried to the airport.,only _____ the film stars had left.
A、to tell B、to be told C、 telling D、told
5、The _______ is just around the corner and you won't miss it.
A、bicycle's shop B、bicycle shop C、bicycles shop D、bicycles' shop
6、Rose was wild with joy _______ the result of the examination.
A、 to B、at C、by D、as
7、-Do you think our basketballers played very well yesterday?
-______.
A、They were not nervous at all.B、They were still young.
C、They played naturally.D、They couldn't have done better.

关于句子结构和虚拟语气的问题
The atomic structure is,___________ ,a miniature solar sysstem.
a.as it were b.as if they were c.as if it were .d as if are
请问：1请分析一下句子结构．
2.这句话是不是虚拟语气?

The atomic number of an element X is 15.The number of electrons in an anion of X is?
但是eleltrons不是等同atomic number吗?
A 10
B 12
C 15
D 18

英语翻译
A sigma is formed when there is end-on overlap of atomic orbitals.
A pi is formed when there is sideways overlap of atomic orbitals.

why is this the relative atomic mass of chlorine not a whole number
please answer it in english

100分求一道物理题,英文
If carbon (C,with an atomic weight of 12,combines with oxygen (O),with an atomic weight of 16,to form carbon dioxide (CO2),how many grams of carbon would react with 288g of oxygen?

sub-atomic是什麽意思?
如题

In future when solar energy and atomic energy come into wide use,our ____ upon fossil fuels (矿物燃料) will not be as great as it is today.
选项:
a、tension
b、pressure
c、independence
d、dependence

sat2化学 atomic spectra, spectroscopy,wave mechanic
sat2化学
atomic spectra, spectroscopy,wave mechanical model这三个板块要掌握哪些知识？ （不是知识点，是具体给我讲解一下）
高中没学过，巴朗看了不太清楚

Hydrogen is the lightest element with an atomic weight of 1.008 翻译这句。

语法：atomic nuclei are heavier than indicated by the number of positive charges
than 后还能跟 被动式indicated?（我懂翻译）
sth can be studied in the region to the left of the cathode
to 在语法上是怎么回事?难道是固定搭配?（sth可以在阴***边的区域被研究）

元素周期表的排列
为什麼是以他们的atomic number(原子序?)来排而不是relative atomic masses(相对原子质量?)来排?

从句 分析结果
A atomic bomb dropped on Hiroshima in 1945,after they were dropped,
people at the time felt that they had let the genie out of the bottle.
请问老师这是一个宾语从句吗,felt动词后面 that在从句中的成分是什么?that后面主谓宾都齐全了为什么还要用thai代词呢?

2道物理题,
explain why the relative atomic mass of the atom is less than the sum of the nucleons
解释为什么原子相对质量小于核子总数.
2.under particular conditions not all the heat energy is shown by a rise in temperature,explain in as much detail why this is.
在特定的条件下不是所有的热能量都是显示在上升的气温,尽可能的详细解释为什么.