This article presents the results of simulating LED of differently originated graphite films, of a field action on a set of stable molecules, and of an irreversible in-field reconstruction of the diamondlike film surface, which demonstrates a possible nano-sized memory element creation. 1996 John ...
an element is a substance ,all of ___ atoms have the same atomic number为什么选whose ?. 答案 首先句子后面是作定语的,由主句可以知道,修饰的是主语element.因为atoms是原子的意思,对于元素来说,逻辑关系自然是“元素里的原子”,所以element和atoms具有从属关系,用whose(注意啦!在定语从句表示从属关系的...
【题目】Atoms are building materials ofall matter, because by putting together atoms in different ways, all elements and compoundscan be formed .An element is a substance or a kind of thing that has only one type of atom . Pure oxygen has only oxygen atoms . Elements aresubstances which ...
It should be stressed that there is a connection between the number of protons in an element, the atomic number that distinguishes one element from another, and the number of electrons it has. In all electrically neutral atoms, the number of electrons is the same as the number of protons. ...
Whentwoelementsformdifferentcompounds,themassratiooftheelementsinonecompoundisrelatedtothemassratiointheotherbyasmallwholenumber. Example: CarbonMonoxide(CO)12gCand16gO CarbonDioxide(CO2)12gCand32gO Thereisa1:2ratioofoxygenbetweenthetwo compounds. ...
The meaning of ATOM is the smallest particle of an element that can exist either alone or in combination. How to use atom in a sentence. Did you know?
1 Copyright©2004PearsonEducationInc.,publishingasBenjaminCummings.AtomicTheory Matteriscomposedoftinyparticlescalledatoms.Atomsineachelementaresimilaranddifferentfromatomsofotherelements.Atomsoftwoormoredifferentelementscombineinsimpleratiostoformcompounds.Achemicalreactioninvolveschangesinthearrangementsofatoms.2 Copyrig...
in an atom is often-but not always-thesame.Every element has a different number of protons.This helps make it differentfrom another element.An element's atomic number is the same as its number ofprotons.For example,hydrogen has only 1 proton.So this means thatit has an atomic number of ...
25 Which of the following statements about atoms and ions is correct?C A The nucleon number of an element is the number of neutrons. B The number of neutrons and electrons are the same in an atom. C An aton with atomic number of 5 will lose 3 electrons to form a positive ion. D ...
2. Atoms of a given element are identical in properties, but atoms of one element are different from the atoms of all other elements. 3. Compounds form when atoms of two or more different elements combine in whole number ratios. 4. Chemical reactions do not create or destroy atoms, they ...