What is the smallest unit of matter? A. Atom. B. Molecule. C. Electron. D. Proton. 相关知识点: 试题来源: 解析 A。解析:原子是物质的最小单位。选项 B,分子不是最小单位;选项 C,电子是原子的一部分;选项 D,质子也是原子的一部分。
根据第四段Itisnaturalbutwrongtovisualizethesingularityas a kindofpackedspothangingin a dark,boundlessvoid (虚空).Thereisnospace,nodarkness.Thesingularityhasno "around" aroundit.Wecan'tevenaskhowlongithasbeenthere-whetherithasjustlatelyexplodedintobeing,like a goodidea,orwhetherithasbeenthereforever,...
What is the smallest unit of matter? A. Atom B. Molecule C. Electron D. Proton 相关知识点: 试题来源: 解析 A。本题考查对物质最小单位的了解,原子是物质的最小单位。B 选项分子不是最小单位;C 选项电子是原子的组成部分;D 选项质子也是原子的组成部分。
They are (obviously) much smaller than the atom itself and have the following properties: Particle Symbol Mass (atomic mass unit u) Charge Proton p 1 +1 Electron e 1/1836≈ 0.0005 ≈ zero -1 Neutron n 1 0(neutral) ≈ means "approximately equal to" The nucleus of an atom: Each atom...
Would you consider a single unit of hydrogen to be an example of an atom? Keep in mind, most hydrogen "atoms" do not have a proton, neutron, and electron. Giventhat the number of protonsdetermines the identity of an element, many scientists consider a single proton to be anatom of the...
Protons and neutrons have approximately the same mass. However, one proton is about 1,835 times more massive than an electron. Atoms always have an equal number of protons and electrons, and the number of protons and neutrons is usually the same as well. Adding a proton to an atom makes ...
Thomson provided the first hint that an atom is made of even smaller particles. Can we see an atom? Atoms are really small. So small, in fact, that it's impossible to see one with the naked eye, even with the most powerful of microscopes. ... Now, a photograph shows a single atom...
A proton (质子) is an infinitesimal (无穷小的) part of an atom. Now imagine if you can (and of course you can’t) make smaller one of those protons down to a billionth of its normal size into a space so small that it would make a proton look huge. Now pack into that tiny, tin...
A proton (质子) is an infinitesimal (无穷小的) part of an atom. Now imagine if you can (and of c-e卷通组卷网
Together, protons and electrons form an atom'snucleus. A proton has a positive charge that counters the electron's negative charge. When an atom has the same number of protons and electrons, it is in a neutral state. Electrons are unique from the other particles in multiple ways. They exis...