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
’ explains Oganessian. ‘It has 20 protons, 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
What is the atomic number for francium? What is the chemical symbol for bohrium? What is the chemical element arsenic? What is the symbol for an atom containing 20 protons and 22 neutrons? Explore our homework questions and answers library Search Browse Browse by subject...
What is the atomic number of an element with 6 protons, 7 neutrons and 6 electrons? What is the atomic number of an element with 9 protons, 10 neutrons and 8 electrons? A) 10 B) 19 C) 9 D) 28 What is the atomic number of an element with 8 protons, 9 neutrons, and 8 electrons...
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...
For example, the mass number of a carbon atom with 6 protons and 6 neutrons in its nucleus is 12. Isotopes Although all atoms of an element have the same number of protons in their nuclei, they may not all have the same number of neutrons. Atoms of an element with the same mass ...
ICSEC - Grade 09 - CHEMISTRY - Atomic Structure And Chemical Bonding - Q23
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What element is a metal with 4 electrons in its outer shell? What is more reactive, calcium or magnesium? What is the chemical formula for calcium hydroxide? What chemical element is Sb? What is the formula for calcium fluoride? How many neutrons are in calcium?