What element has 16 protons? What element has 81 protons? What element has 6 protons? What element has 20 protons? What chemical element is P? What chemical element is Sb? Which element has 3 protons? Which element has 27 protons?
What element has an atomic number of 10? How many protons does a neutral atom of oxygen-18 have? What region of an atom contains the protons and neutrons? What is a valence electron? What is the symbol for the ion with 19 protons and 18 electrons?
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
Atoms: Atoms are the purest form of matter. They consist of protons, neutrons, and electrons. The periodic table lists all of the different types of atoms that are known to exist and are known as elements. Answer and Explanation: An atom that has more protons than electrons is called a ...
ICSEC - Grade 09 - CHEMISTRY - Atomic Structure And Chemical Bonding - Q23
What chemical element is Ge? Elements and Symbols: Chemical elements are substances made from a single type of atom. They are designated by a two-letter symbol in which the first letter is always capitalized while the second letter is lower-case. Often, the symbol is similar to the name, ...
Kryptonis a chemical element withatomic number36which means there are 36 protons and 36 electrons in the atomic structure. Thechemical symbolfor Krypton isKr. Krypton is a member of group 18 (noble gases) elements. A colorless, odorless, tasteless noble gas, krypton occurs in trace amounts in...
aThe element X has three isotopes: X-221, X-220, and X-218, with masses 220.9, 220.0, and 218.1 amu. The relative abundances of these three isotopes are 74.22%, 12.78%, and 13.00%, respectively. Calculate the atomic mass of element X. 元素x有三同位素: X-221, X-220和X-218,与大量...
When the stated mass number of an element is not a whole number that doesnotmean that there are parts of protons or neutrons present in the atom. It means that that mass number has been calculated to take into consideration theproportions of the different isotopes of that element believed to...
For example, Ca2+is the symbol for a calcium ion that has a positive 2 charge. Since the atomic number of calcium is 20 and the charge is positive, this means the ion has 20 - 2 or 18 electrons. Chemical Elements To be an element, a substance has to at least have protons, since ...