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
百度试题 结果1 题目10 An isotope of element Y has 19 protons and 20 neutrons in its nucleus. Which is the symbol for the ion of Y? B2039A YB19192039C YD1919 相关知识点: 试题来源: 解析 B 反馈 收藏
What is the symbol and name of the element with the following electron configuration? Xe 6s1 On the periodic table, all the elements within Group 16 have the same number of: a. valence electrons b. energy levels c. protons d. neutrons ...
Give the element symbol, atomic number, number of protons, number of neutrons, mass number, and total number of electrons for francium-228.Give the: A) Element Symbol, B) Atomic Number, C) Number of Protons, D) Number of Neutrons, ...
Which element has atomic number = 20? Do not spell out the name of the element. Express your answer using only the proper elemental symbol. What is the symbol of an ion with 16 protons, 18 neutrons, and 18 electrons? What is a Lewis dot symbol? To what elements does the symbol mainly...
so it lies on the right-hand side of the modern periodic table. The neon element symbol is Ne. It has the atomic number 10. So, in the neon atom, the number of protons and electrons is 10 each. Themass numberof neon is 20 amu. So, the number of neutrons in the neon atom is 10...
ICSEC - Grade 09 - CHEMISTRY - Atomic Structure And Chemical Bonding - Q23
20 neutrons. But in natural calcium, about 0.19% [of it] is calcium-48, which has 20 protons and 28 neutrons. It’s very expensive, terribly expensive. One gram of calcium-48 costs $200,000 (£160,000).’ During operation, the accelerator uses 0.5mg an hour, with experiments running...
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What is the atomic number of an element with 8 protons, 9 neutrons, and 8 electrons? An unknown element is found to contain 45 protons and an atomic mass of 64, what is its atomic number? A. It cannot be determined. B. 19 C. 45 D. 64 ...