即原子中质子数=A-Z The term element refers to a pure substance with atoms all kinds of a single kind. To the chemist the “kind” of an atom is specified by its atomic number, since this is the property that determines its chemical behavior. At present all the atoms from Z=1 to Z...
原题.Estimate the number of electrons in human body,assuming that it is made only of water and weighs 70 kg.(additional information:the molar mass of water is about 18 g/mol,which means that in 18 g of water the number of molecules equals to the Avogadro
Using electrons in boxes,show how the electrons are arranged in the following atoms.1.Lithium2.Magnesium3.Silicon4.Boron 答案 这个就是画电子图,比如第一个是锂 电子图是 +3 圆圈 第一层 2 第二层1第二个是镁 电子图是 +12 圆圈 第一层2 第二层8 第三层2剩下的自己画吧. 结果二 题目 【题目...
(1) Atoms and Electrons (2) The Atom and the Bohr Theory of its Structure: an Elementary PresentationSCIENCE is steadily becoming severely specialised. The proportion of amateurs (in the restricted sense of the word) among original workers of all ranks decreases slowly but surely....
阅读下列短文,理解原子外层电子的作用,并回答问题。For atoms,electrons hold the key to almost the whole of chem
单选题: All atoms of a given element have the same ___. 选项: A. number of electrons and neutrons B. mass C. density D. number of protons E. number of neutrons 相关知识点: 试题来源: 解析 [number of protons] 反馈 收藏
(a) Determining the number of neutrons – Subtract the Atomic Number from the Mass Number (round the number) Atom - Electron Cloud Makes up about 99% of the atomic volume. A. Electrons – Negative charge (1) The arrangement of electrons determines the chemical properties of an element. (a...
Atoms are comprised of three basic components. In the nucleus, there are protons (positive charge) and neutrons (no charge). These are where the vast majority of the weight is and will determine what type of atom this is. Electrons (negatively charged) orbit relatively far away from the ...
Answer to: The number of (a) ___ in the nucleus determines what element a substance is. If the number of (b) ___ changes, the atom is...
But mostly electrons stay close to their nucleusas clouds of negative charged density that shift and move with time.How electrons from one atominteract withelectrons from another determines almost everything. 但是大部分时间电子都距离原子核很近,呈现为带负电的电子云,电子云会随着时间改变位置。一个原子...