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
An atom consists of a nucleus, which contains protons and neutrons, surrounded by electrons. The number of protons determines the element of the atom, while the number of neutrons can vary. Electrons exist in energy levels or shells around the nucleus. 开学特惠 开通会员专享超值优惠 助力考试高...
may have isotopes with different atomic weights due to more neutrons in the nucleus c. have characteristics chemical reactivity related to the "valence" electrons What substances are secreted by plasma cells? What is blood cell formation ...
- The element uranium having the atomic number Z = 92 have been irradiated with many slow neutrons and many new radioactive elements up to Z = 112 and earlier it has been named as ununbium but now its names have been discovered and is now as Copernicium (Cn)...
An element that has the electron configuration (Ne)3s2 is in the group: a. 2. b. 5. Write out the electron configuration for the ground state of the phosphorus atom, for which Z = 15. What is the electron configuration of atom in the ground state? a) Write out t...
Write the symbol for the nuclide with 47 protons and 61 neutrons and identify the element. Consider the ion Boron^{4+} (Z = 5, one electron, 5 protons, and 6 neutrons) in the context of the Bohr model. If the electron bound to Boron^{4+} is initiall...
FIELD: medicine.;SUBSTANCE: invention relates to a radiation-attenuating material, a neutron-moderating material for use in a boron-neutron capturing therapy (BNCT) beam forming unit. Material which slows neutrons contains three elements, i.e. Mg, Al and F, where weight fraction of element Mg ...
A) An element is a substance whose atoms all have the same atomic number. B) The atoms ofan element all contain the same number ofprotons C) The atoms ofan element all contain the same numbers of neutrons D) An element is a substance that cannot be broken down any further by chemical ...
\text{Element Symbol} \quad _{Z}^{A} \) - Where: - \( A \) = Mass number (number of protons + number of neutrons) - \( Z \) = Atomic number (number of protons) 2. Analyzing Each Option: - (i) .7935Br: - Here, \( Z = 35 \) (atomic number of Bromine) and \( A...
An atom is a neutral species that have the same number of protons and neutrons. When electrons are added or removed from an atom of an element, a charged species is formed known as ions. Answer and Explanation:1 Become a Study.com member...