百度试题 结果1 题目6 An atom of element Q contains 19 electrons, 19 protons and 20 neutrons.What is Q? B A calcium B potassium C strontium D yttrium 相关知识点: 试题来源: 解析 B 反馈 收藏
What chemical element is Cu? Which chemical element has the symbol B? Which chemical element has the symbol Pt? What chemical element has 4 protons? What element has 10 electrons? What element has 13 electrons? Which chemical element has the symbol Sn?
An atom has 20 electrons and 20 neutrons. What is the mass of this atom? What is the difference between an isotope and an element? What is the atomic mass of an atom that has 6 protons, 6 neutrons, and 6 electrons? What is roentgenium's atomic mass?
N(7), F(9), P(15), Ar(18) View Solution An element has electronic configuration 2, 8, 3. What is the atomic number of the element ? To which (i) group and (ii) period does this element belong ? View Solution An element has 2 electrons in the M shell. What is the atomic...
What element has 13 electrons? What chemical element is Se? What is the most common chemical element on Earth? What chemical element is cinnabar derived from? What chemical elements make up Kevlar? What are the Group 18 elements? What are the first 20 elements and their atomic numbers?
What is the symbol for the ion with 19 protons and 18 electrons? If an atom has an atomic number of 8, how many protons will it have? Which element has the highest atomic number? What is a helium-4 atom with no electron? What is the atomic mass/weight of an atom that has 24 pro...
The most active element of the group is Fluorine! Write the Lewis structure for O2 The composition of a compound contains only C, O, and Hatoms. What type of bond does the compound have? All NON-Metals so bonds must be COVALENT According to the periodic table, which twoelementsin each ...
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An N-type semiconductor is one that carries current in the form of negatively-charged electrons. This is very similar to conduction of current in a wire. A P-type semiconductor is one that carries current predominantly as electron deficiencies called holes. A hole has a positive electric charge...
It has valence +1 because it has 1 more electrons than a certain noble gas. What element is it? Express your answer using its one- or twoWhat name is given to the elements with atomic numbers greater than 92?What does the atomic number of an element tell you about the element?