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
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?
What chemical element is Ge? What is the chemical element radon? What is the chemical element selenium? What element is a metal with 4 electrons in its outer shell? What is the chemical element fluorine? Which chemical element has the symbol Na?
If an atom contains 14 protons, it is an atom of which element? What is the atomic number of an atom that has 6 protons, 6 neutrons, and 6 electrons? Which atom has the smallest number of neutrons? What is an atom that has a different number of neutrons than other atoms of the sam...
Consider the element Au (Atomic Mass = 197). How many protons, neutrons, and electrons does a neutral atom have? An element has an atomic number of 114 and an atomic mass of 285. How many protons, neutrons, and electrons does a neutral atom of this element have?
Silicon has total 14 electrons in its isolated atom. The first orbit consists of 2 electrons. The second orbit consists of 8 electrons and the third orbit consists of 4 electrons. As there are four electrons in the outer most orbit of a silicon atom, the silicon is a tetravalent element....
a single element contains atoms that all have the same number of protons. The number of neutrons and electrons does not impact the identity of an element, so if you had a sample containing protium, deuterium, and tritium (the three isotopes of hydrogen), it would still be a pure element....
Valence electrons are those electrons that reside in the outermost shell surrounding an atomic nucleus. Valence electrons are of crucial importance because they lend deep insight into an element’s chemical properties: whether it is electronegative or el
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?
Question: What element has the atomic number 74? Numbered Mass: The atomic number of an element refers to the number of protons/electrons located in the nucleus of an atom of that element. The atomic mass is the sum of the number of protons and the number of neutrons. ...