How do you convert from amount of substance in moles to the number of atoms in an element?Moles:A mole is a scientific number used in chemistry to designate a set number of atoms or molecules. Each will have the same number of atoms or molecules as there a...
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 ...
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 ...
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. ...
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 ...
For example, an atom of lithium, atomic number 3, contains three protons and three electrons. 如,锂原子的序数为3,包含3个质子和3个电子。 Figure 4.15 In the periodic table, each element is represented by its chemical name, atomic number, chemical symbol, and average atomic mass.在元素周期表...
1 Copyright©2004PearsonEducationInc.,publishingasBenjaminCummings.AtomicTheory Matteriscomposedoftinyparticlescalledatoms.Atomsineachelementaresimilaranddifferentfromatomsofotherelements.Atomsoftwoormoredifferentelementscombineinsimpleratiostoformcompounds.Achemicalreactioninvolveschangesinthearrangementsofatoms.2 Copyrig...
An atom is the smallest possible unit of an element. Since all forms of matter consist of a combination of one or more elements, atoms are the building blocks that constitute all the matter in the universe. Currently, 110 different elements, and thus 110 different kinds of atoms, are known...