the average weight of a molecule of an element or compound measured in units based on 1/12 the weight of the carbon-12 atom; the sum of the atomic weights of all the atoms in a molecule.Abbr.:mol. wt. [1875–80] Random House Kernerman Webster's College Dictionary, © 2010 K Dicti...
Atomsize (copythisslide)ElectronstakeupmostofthespaceMoreprotonsandneutrons=biggernucleusPutthefollowinginorderofsize: Hydrideion(H-)Alphaparticle(Henucleus)HeliumatomHydrogenion(H+)MassNumber (copythisslide) Thetotalnumberofprotonsandneutronsinthenucleusiscalledthemass...
The electrons surround the nucleus and occupy most of the volume of the atom. The Atomic Number is the number of protons an atom has. It never changes. In neutral atoms the number of protons equals the number of electrons. Atom size (copy this slide) Electrons take up most of the space...
The mass number of an atom is the number of protons plus neutrons it has. Chromium (Cr), for example, has 24 protons (thus defining the element as chromium) and in its most stable form − that is, the isotope that appears most often in nature − it has 28 neutrons. Its mass num...
The mean of an atom is its value as a float. Null is returned ifxis empty, or contains both positive and negative infinity. Wherexis a vector null items are ignored. q)avg1232fq)avg10n23/ vector: null items are ignored2fq)avg(12;0N4)/ nested: null items are preserved0n3q)avg1.00...
the atomic number is the number of protons an atom has. it never changes. in neutral atoms the number of protons equals the number of electrons.atom size (copy this slid 3、e)nelectrons take up most of the spacenmore protons and neutrons = bigger nucleusnput the following in order of ...
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5) atom cluster size 原子团尺寸 例句>> 6) average grain size 平均晶粒尺寸 1. Nondestructive evaluation of average grain size of coarse grain materials based on ultrasonic transmissive technique; 超声波透射技术无损评价粗晶材料平均晶粒尺寸 2. The influence of current density on the ...
Inhomogeneities that on the average have an atom density function with rotational symmetry around some unique axis give rise to elliptically symmetric small-angle scattering. The usual analysis involves cuts along the principal axes of the contours, which uses only part of the data. A better method...